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TNPSC: Number & alphabet series — practice questions
Logical Reasoning & Mental Ability · Group 2 & 2A · தமிழ் & English
⚡ Season 1 · Group 2 & 2A
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5 questions
Day 31 of the 60-day Group 2 plan
Number & alphabet series is part of Logical Reasoning & Mental Ability in the TNPSC syllabus (Group 2 & 2A). The questions below are free, bilingual (தமிழ் & English) and each one has a full explanation. For a structured path, this topic is Day 31 of the free 60-day TNPSC study plan.
Q1. Find the next term in the series: 2, 6, 12, 20, 30, ?
A. 4040
B. 3636
C. 4444
D. 4242
Show answer & explanation
Answer: D. 42 · 42
The differences are 4, 6, 8, 10, 12; adding 12 to 30 gives 42.
Q2. What comes next: 3, 6, 12, 24, ?
A. 4242
B. 4444
C. 4848
D. 5050
Show answer & explanation
Answer: C. 48 · 48
Each term is double the previous one: 24 x 2 = 48.
Q3. Find the missing number: 1, 4, 9, 16, 25, ?
A. 3030
B. 3535
C. 4949
D. 3636
Show answer & explanation
Answer: D. 36 · 36
These are perfect squares; 6 squared = 36.
Q4. Complete the letter series: A, C, E, G, ?
A. HH
B. II
C. JJ
D. KK
Show answer & explanation
Answer: B. I · I
Each letter advances by two positions: G + 2 = I.
Q5. Find the next term: 5, 11, 23, 47, ?
A. 9393
B. 9494
C. 9595
D. 9696
Show answer & explanation
Answer: C. 95 · 95
Each term is the previous term times 2 plus 1: 47 x 2 + 1 = 95.