Ch 2: Letter & Alphanumeric Series | Reasoning

Dosto, pichhle chapter mein numbers ka pattern pakda tha — ab wahi kaam letters ke saath. Trick sirf itni si hai: har letter ko uska number maan lo (A = 1, B = 2 … Z = 26). Uske baad ye bhi number series hi ban jaati hai!

Isme Alphanumeric series bhi aati hai — jahan letters, numbers aur kabhi symbols mile-jule hote hain, aur ginti wale sawal poochhe jaate hain.

CET Group D mein series (number + letter) se 2–3 questions aate hain. Ye chapter alphabet positions par khada hai — ek baar wo pakke ho gaye, to Coding-Decoding (Ch 4) aur Alphabet Test (Ch 5) bhi aasan ho jayenge. Chalo! 💪

1. ⭐ Alphabet ki Positions (poori neenv yahi hai)

Gold wale 5 letters = EJOTY (5, 10, 15, 20, 25) — inhi se kisi bhi letter ki position 2 second mein nikal jati hai.

⭐ EJOTY trick — position nikalne ka sabse fast tarika E = 5, J = 10, O = 15, T = 20, Y = 25 — bas ye 5 yaad rakho.
Kisi bhi letter ki position: sabse paas wale EJOTY letter se gino.
Example: R ki position? → O = 15, R uske 3 aage → 18 ✓ · W? → T = 20, W 3 aage → 23 ✓

📌 Peeche (right) se position ka formula Right se position = 27 − left wali position
"Right se 4th letter kaunsa?" → 27 − 4 = 23 → W ✓ (aur ulta bhi: W left se 23rd hai to right se 27−23 = 4th)

2. Letter Series — pattern pakadna

Letters ko number mein badlo, antar dekho, phir wapas letter bana do. Bas!

✏️ Example 1 — A, C, E, G, ? Step 1: Numbers: 1, 3, 5, 7 → antar +2 har baar
Step 2: Agla = 7 + 2 = 9 → I ✓

✏️ Example 2 — B, D, G, K, ? Step 1: Numbers: 2, 4, 7, 11 → antar +2, +3, +4 (badh raha hai)
Step 2: Agla antar +5 → 11 + 5 = 16 → P ✓

✏️ Example 3 — Z, X, V, T, ? Step 1: 26, 24, 22, 20 → −2 har baar (ulta chal raha hai)
Step 2: 20 − 2 = 18 → R ✓

3. Do-Letter wale Groups (jodi series)

Jab AZ, CX, EV… jaise jode aayein, to pehle letter ki alag series aur doosre letter ki alag series banao:

✏️ Example — AZ, CX, EV, ? Step 1: Pehle letters: A, C, E → +2 → agla G
Step 2: Doosre letters: Z, X, V → −2 → agla T
Step 3: Answer = GT ✓

✏️ Example — ACE, BDF, CEG, ? Har group mein teeno letters +1 ho rahe hain (A→B→C, C→D→E, E→F→G) → agla = DFH ✓

4. Letter + Number wali mixed series

✏️ Example — A1, C3, E5, ? Step 1: Letters A, C, E → +2 → agla G (position 7)
Step 2: Numbers 1, 3, 5 → +2 → agla 7
Step 3: Answer = G7 ✓ (dhyan do: number letter ki position hi hai!)

5. ALPHANUMERIC SERIES (letters + numbers + symbols)

Ek lambi line di jati hai, jaise: A 3 B 5 C 7 D 9 — aur sawal ginti wale hote hain:

"Left se 5th element kaunsa hai?" → gino: A(1), 3(2), B(3), 5(4), C(5) ✓
"Kitne numbers ke turant baad koi letter aata hai?"
"Left se 7th ke right mein 3rd kya hai?"

📌 Alphanumeric ka golden rule Har element (letter, number, symbol) ko ek ginti maano — aur ginti hamesha ussi taraf se karo jo sawal mein likha hai (left ya right). Jaldbazi mein taraf badal jana sabse badi galti hai.

6. Alphabetical Order (dictionary wala kram)

✏️ Example — 'REASON' ke letters ko alphabetical order mein rakho. Teesra kaunsa? Step 1: Letters: R, E, A, S, O, N
Step 2: Order: A, E, N, O, R, S
Step 3: Teesra = N ✓

✏️ Type 1 — Simple letter series A, C, E, G → ? Letters ko numbers banao (1,3,5,7), antar dekho (+2), agla number wapas letter bana do → I.

✏️ Type 2 — Jodi/tikdi series (AZ, CX…) Har position ki alag series banao. Pehla letter alag, doosra alag. AZ, CX, EV → GT.

✏️ Type 3 — Position poochna "M ki position?" → EJOTY se: J = 10, M 3 aage → 13.
"Right se 4th?" → 27 − 4 = 23 → W.
"H aur R ke theek beech?" → (8 + 18) ÷ 2 = 13 → M.

✏️ Type 4 — Alphanumeric ginti "A 3 B 5 C 7 D 9 mein left se 5th?" → har cheez ek ginti → C. Ungli rakh ke gino, dimaag mein nahi.

✏️ Type 5 — "X ke left/right mein Yth" Do-step wale sawal: pehle base element dhundo, phir batayi hui disha mein gino.
"20th letter ke left mein 5th?" → 20th = T → left mein 5 = O (20 − 5 = 15).

Trick 1: EJOTY
E-5 · J-10 · O-15 · T-20 · Y-25
Sirf ye 5 yaad karo — kisi bhi letter ki position inse gin ke 2 second mein nikal aayegi. Poori alphabet ratne ki zaroorat nahi!

Trick 2: Right se position ka formula
27 − left wali position
W left se 23rd → right se 27−23 = 4th. (Number series mein bhi yahi: n+1 − position.)

Trick 3: Letters ko numbers likh lo
B, D, G, K → 2, 4, 7, 11
Letter series ko numbers mein badalte hi wo Chapter 1 wali number series ban jati hai — antar likho, khatam.

Trick 4: Beech wala letter = average
(dono positions ka jod) ÷ 2
"H aur R ke theek beech?" → (8+18)/2 = 13 → M. Ginne ki zaroorat nahi.

Trick 5: Ulti (reverse) alphabet ke 5 nishan
Z-1 · U-6 · P-11 · K-16 · F-21 · A-26
Reverse wale sawalon ke liye ye EJOTY ka ulta version hai — Z se ginna aasan ho jata hai.

❌ Galti 1: Position ginne mein ek ki galti A = 1 hai, 0 nahi. Aur Z = 26. Jaldi mein log M ko 12 likh dete hain (sahi 13). EJOTY se cross-check karne ki aadat daalo.

❌ Galti 2: Left aur right ki taraf mix karna "Right se 5th" aur "left se 5th" bilkul alag hain. Sawal mein taraf par nishan laga do, phir gino — ye ek aadat kai marks bachati hai.

❌ Galti 3: Jodi series mein dono letters ka ek hi rule maan lena AZ, CX, EV mein pehla +2 aur doosra −2 chal raha hai — dono ka rule alag hai. Har position ki alag series banao.

❌ Galti 4: Alphanumeric mein sirf letters ginna "5th element" poocha ho to numbers aur symbols bhi ginti mein aate hain. Sirf letters ginne se answer galat aa jayega.

❌ Galti 5: Reverse series mein aage ki taraf badhna Z, X, V, T ghat rahi hai — agla R hai, V nahi. Antar ka sign (plus ya minus) pehle likh lo.

EJOTY ka matlab?tap 👆

E-5, J-10, O-15, T-20, Y-25

Right se position ka formula?tap 👆

27 − left wali position

M ki position?tap 👆

13 (J = 10 se 3 aage)

R ki position?tap 👆

18 (O = 15 se 3 aage)

Right se 4th letter?tap 👆

W (27 − 4 = 23)

A, C, E, G → agla?tap 👆

I (+2)

B, D, G, K → agla?tap 👆

P (+2, +3, +4, +5)

Z, X, V, T → agla?tap 👆

R (−2)

AZ, CX, EV → agla?tap 👆

GT (pehla +2, doosra −2)

ACE, BDF, CEG → agla?tap 👆

DFH (teeno letters +1)

A1, C3, E5 → agla?tap 👆

G7

H aur R ke theek beech ka letter?tap 👆

M ((8+18)/2 = 13)

20th letter kaunsa?tap 👆

T (EJOTY)

Reverse alphabet ke nishan?tap 👆

Z-1, U-6, P-11, K-16, F-21, A-26

Alphanumeric mein ginti kaise?tap 👆

Letters + numbers + symbols sab ginti mein

Jodi series (AZ, CX) mein kya karein?tap 👆

Har position ki alag series banao

REASON alphabetical mein 3rd?tap 👆

N (A, E, N, O, R, S)

Letter series ka pehla kaam?tap 👆

Letters ko numbers likho

Cheez	Value / Rule
EJOTY	E-5 · J-10 · O-15 · T-20 · Y-25
Reverse nishan	Z-1 · U-6 · P-11 · K-16 · F-21 · A-26
Right se position	27 − left position
Beech ka letter	(dono positions ka jod) ÷ 2
Letter series ka step 1	Letters → numbers
Jodi series (AZ, CX)	Har position ki alag series
A, C, E, G	+2 → I
Z, X, V, T	−2 → R
Alphanumeric ginti	Sab elements ginti mein (letters+numbers+symbols)
Alphabetical order	Dictionary wala kram (A→Z)
Kul letters	26 (vowels 5: A, E, I, O, U)
13th aur 14th letter	M aur N (beech ka jod)

🎯 Score: 0 / 0 Total questions: 14

Practice (exam-style)

Q1. Complete the series: A, C, E, G, ?

💡 1, 3, 5, 7 (+2) → agla 9 = I.

Practice (exam-style)

Q2. Complete the series: B, D, G, K, ?

💡 2, 4, 7, 11 → antar +2, +3, +4 → agla +5 = 16 = P.

Practice (exam-style)

Q3. Complete the series: AZ, CX, EV, ?

💡 Pehle letters A, C, E (+2) → G; doosre Z, X, V (−2) → T.

Practice (exam-style)

Q4. Complete the series: Z, X, V, T, ?

💡 26, 24, 22, 20 (−2) → agla 18 = R.

Practice (exam-style)

Q5. What is the position of the letter 'M' in the English alphabet?

💡 J = 10 (EJOTY) → K 11, L 12, M = 13.

Practice (exam-style)

Q6. Which letter is 4th from the right end of the English alphabet?

💡 27 − 4 = 23 → 23rd letter = W (Z, Y, X, W gin ke bhi wahi).

Practice (exam-style)

Q7. Complete the series: ACE, BDF, CEG, ?

💡 Har group ke teeno letters +1 → C→D, E→F, G→H = DFH.

Practice (exam-style)

Q8. If the letters of the word 'REASON' are arranged in alphabetical order, which letter comes third?

💡 Order: A, E, N, O, R, S → teesra = N.

Practice (exam-style)

Q9. In the series A 3 B 5 C 7 D 9, which element is 5th from the left?

💡 Gino: A(1), 3(2), B(3), 5(4), C(5) → C. (Numbers bhi ginti mein aate hain!)

Practice (exam-style)

Q10. Which letter lies exactly midway between H and R?

💡 H = 8, R = 18 → (8+18)/2 = 13 → M.

Practice (exam-style)

Q11. Complete the series: W, T, Q, N, ?

💡 23, 20, 17, 14 (−3) → agla 11 = K.

Practice (exam-style)

Q12. Complete the series: AB, BC, CD, ?

💡 Dono letters +1 → C→D aur D→E = DE.

Practice (exam-style)

Q13. Complete the series: A1, C3, E5, ?

💡 Letters +2 (A, C, E → G) aur numbers +2 (1, 3, 5 → 7) = G7.

Practice (exam-style)

Q14. Which letter is 5th to the left of the 20th letter from the left in the English alphabet?

💡 20th letter = T; uske 5 left = position 15 = O.

Poora chapter ek line par khada hai — letters ko numbers maan lo (A=1 … Z=26), phir ye Chapter 1 wali number series hi ban jati hai. Position nikalne ke liye EJOTY (5, 10, 15, 20, 25) ratt lo, aur right se position ke liye 27 − left position. Jodi series (AZ, CX, EV) mein har position ki alag series banao — pehla +2 aur doosra −2 chal sakta hai. Beech ka letter chahiye to dono positions ka average le lo (H aur R → 13 → M). Alphanumeric mein numbers aur symbols bhi ginti mein aate hain, aur left-right ki taraf par nishan lagana mat bhoolna. 🚀