IBPS PO Reasoning: Alphanumeric Series questions with solutions

Q1. B2CD, _____, BCD4, B5CD, BC6D

1. B2C2D
2. BC3D
3. B2C3D
4. BCD7

Answer: BC3D

The number progresses as 2, 3, 4, 5, 6 while shifting one position to the right each time: B2CD, BC3D, BCD4, B5CD, BC6D. Thus the missing term is BC3D.

Q2. How many pairs of letters are there in the word 'TRANSMISSION' which have as many letters between them (in the word) as in the English alphabet (both forward and backward directions)?

1. One
2. Two
3. Three
4. Four

Answer: Four

Word: T,R,A,N,S,M,I,S,S,I,O,N (positions 1-12). Valid pairs where gap in word = gap in alphabet: (1) N(4)–S(9): 4 between in word (S,M,I,S); N=14, S=19: O,P,Q,R = 4 between ✓. (2) M(6)–I(10): 3 between in word (I,S,S); M=13, I=9 backward: L,K,J = 3 ✓. (3) I(7)–N(12): 4 between in word (S,S,I,O); I=9, N=14: J,K,L,M = 4 ✓. (4) O(11)–N(12): 0 between in word; O=15, N=14: adjacent = 0 ✓. Total: 4 pairs.

Q3. In the word 'CREATION', how many pairs of letters have the same number of letters between them in the word as in the English alphabet (both forward and backward direction)?

1. Four
2. Two
3. One
4. Three

Answer: Two

Checking all pairs: C(1)–E(3): 1 between in word; |C-E|=2, D=1 between in alphabet ✓. O(7)–N(8): 0 between in word; O and N adjacent in alphabet, 0 between ✓. No other pair matches. Total: 2.

Q4. In the word 'EXPANSION': arrange all vowels alphabetically, then all consonants alphabetically. Then replace each vowel with the previous letter and each consonant with the next letter. Which letter is 3rd from the left end?

1. Z
2. D
3. H
4. N

Answer: H

EXPANSION letters: E,X,P,A,N,S,I,O,N. Vowels: E,A,I,O → sorted: A,E,I,O. Consonants: X,P,N,S,N → sorted: N,N,P,S,X. Vowels→previous letter: A→Z, E→D, I→H, O→N. Consonants→next letter: N→O, N→O, P→Q, S→T, X→Y. Combined sequence: Z,D,H,N,O,O,Q,T,Y. 3rd from left = H.