CSEET Logical Reasoning: Inserting Missing Characters Questions with Answers & Explanations

CSEET Logical Reasoning: Inserting Missing Characters Questions with Answers & Explanations

Why?

Inserting Missing Characters tests your ability to recognize patterns among numbers, alphabets, or symbols — both horizontally and vertically.

The goal is to find the missing character that makes the sequence or relationship logically consistent.

CSEET – Inserting Missing Characters MCQs with Answers & Explanations

Q1.Find the missing number:

4, 9, 16, 25, ?

(A) 30 (B)**35 (C)**36 (D)**49

 Answer: (C) 36

Explanation:

Pattern = squares of natural numbers → 2², 3², 4², 5², so next is 6² = 36.

Q2.Find the missing term:

2, 6, 12, 20, ?

(A) 30 (B)**28 (C)**36 (D)**40

Answer: (A) 30

Explanation:

Pattern = n × (n + 1):

1×2=2, 2×3=6, 3×4=12, 4×5=20, 5×6=30.

Q3.Find the missing term:

A, C, F, J, O, ?

(A) T (B)**U (C)**V (D)**W

 Answer: (B) U

Explanation:

Position pattern: +2, +3, +4, +5 → A(1), C(3), F(6), J(10), O(15), next = 15+6 = 21 → U.

Q4.Find the missing character:

AZ, BY, CX, DW, ?

(A) EV (B)**EX (C)**EY (D)**EZ

Answer: (A) EV

Explanation:

First letter increasing (A, B, C, D, E);

Second letter decreasing (Z, Y, X, W, V).

Q5.Find the missing number:

1, 8, 27, 64, ?

(A) 100 (B)**125 (C)**150 (D)**200

Answer: (B) 125

Explanation:

Pattern = cubes → 1³, 2³, 3³, 4³, 5³.

Q6.Find the missing number in the series:

2, 3, 5, 8, 12, 17, ?

(A) 23 (B)**24 (C)**25 (D)**26

 Answer: (A) 23

Explanation:

Difference increases by +1:

(+1, +2, +3, +4, +5, next +6 → 17+6=23).

Q7.Find the missing number:

5, 10, 20, 40, ?

(A) 60 (B)**70 (C)**80 (D)**90

Answer: (C) 80

Explanation:

Each term ×2 → 5×2=10, 10×2=20, 20×2=40, 40×2=80.

Q8.Find the missing term:

Z, X, U, Q, L, ?

(A) F (B)**G (C)**H (D)**I

Answer: (A) F

Explanation:

Alphabet positions: Z(26), X(24), U(21), Q(17), L(12) → differences = -2, -3, -4, -5, so next -6 → 12-6=6 → F.

Q9.Find the missing character in the series:

A1, C2, F3, J4, O5, ?

(A) Q6 (B)**R6 (C)**U6 (D)**U7

Answer: (C) U6

Explanation:

Letter gaps: +2, +3, +4, +5, +6 → A, C, F, J, O, U.

Numbers increase by +1 → 1, 2, 3, 4, 5, 6.

Q10.Find the missing number:

3, 9, 27, 81, ?

(A) 162 (B)**243 (C)**324 (D)**300

Answer: (B) 243

Explanation:

Each term ×3 → 3×3=9, 9×3=27, 27×3=81, 81×3=243.

Q11.Find the missing number:

7, 14, 28, 56, ?

(A) 70 (B)**84 (C)**100 (D)**112

Answer: (D) 112

Explanation:

Each term doubles → 7×2=14, 14×2=28, etc.

Q12.Find the missing letter:

B, E, H, K, N, ?

(A) P (B)**Q (C)**R (D)**S

Answer: (B) Q

Explanation:

Alphabetic position increases by +3 → 2, 5, 8, 11, 14, 17 → Q.

Q13.Find the missing character:

ACE, BDF, CEG, DFH, ?

(A) EGI (B)**EFH (C)**EGH (D)**EGI

Answer: (A) EGI

Explanation:

Each letter moves forward by +1 in sequence across terms.

Q14.Find the missing number:

2, 6, 18, 54, ?

(A) 108 (B)**162 (C)**216 (D)**324

Answer: (B) 162

Explanation:

Each term ×3 → 2×3=6, 6×3=18, 18×3=54, 54×3=162.

Q15.Find the missing term:

A1, C3, F6, J10, O15, ?

(A) S21 (B)**U21 (C)**U22 (D)**V22

Answer: (B) U21

Explanation:

Letters: +2, +3, +4, +5, +6 → A, C, F, J, O, U.

Numbers: +2, +3, +4, +5, +6 → 1, 3, 6, 10, 15, 21.

Tips for Solving “Inserting Missing Characters”

l Identify numeric patterns (difference, ratio, squares, cubes).

l Check alphabetic positions (A=1, B=2…Z=26).

l Patterns can be horizontal, vertical, or diagonal.

l Always look for logical increase/decrease or geometric progressions.

 Conclusion

1. “Inserting Missing Characters” questions sharpen your analytical and observation skills.

2. They’re popular in the CSEET Logical Reasoning section because they test pattern recognition, memory, and logic.

3. Practice regularly — once you spot common progressions (like +n, ×n, squares, cubes, or letter shifts), these become quick to solve.