PSEE Number Series 2 — Questions and Answers
Question 1: What is the next number in the series? 3, 6, 12, 24, 48, ___
- 72
- 84
- 96 (Correct answer)
- 100
Correct answer: 96
Each term doubles: 3×2=6, 6×2=12, ..., 48×2=96.
This is a geometric sequence with a common ratio of 2. Each term is multiplied by 2: 3→6→12→24→48→96. Geometric sequences are a staple of PSEE number series questions.
Question 2: What number completes the series? 100, 91, 82, 73, 64, ___
- 53
- 55 (Correct answer)
- 57
- 59
Correct answer: 55
Each term decreases by 9: 100−9=91, ..., 64−9=55.
This is an arithmetic sequence with a common difference of −9. 64 − 9 = 55. Identifying constant differences is a fundamental skill in PSEE number series problems.
Question 3: Find the missing number: 2, 5, 11, 23, 47, ___
- 89
- 93
- 95 (Correct answer)
- 97
Correct answer: 95
Each term = previous × 2 + 1: 47×2+1=95.
The rule is: next = current × 2 + 1. Verifying: 2→5 (2×2+1=5) ✓, 5→11 ✓, 11→23 ✓, 23→47 ✓, 47→95 ✓. Mixed operation series like this are common in PSEE tests.
Question 4: What is the next term? 1, 1, 2, 3, 5, 8, 13, ___
- 18
- 20
- 21 (Correct answer)
- 23
Correct answer: 21
This is the Fibonacci sequence: each term = sum of the two preceding terms. 8+13=21.
The Fibonacci sequence rule: term(n) = term(n−1) + term(n−2). 8 + 13 = 21. Recognizing Fibonacci and similar additive sequences is tested in PSEE number series sections.
Question 5: Identify the next number: 4, 9, 16, 25, 36, ___
- 42
- 45
- 49 (Correct answer)
- 52
Correct answer: 49
These are perfect squares: 2²=4, 3²=9, ..., 6²=36, 7²=49.
The series consists of perfect squares of integers starting from 2: 2²=4, 3²=9, 4²=16, 5²=25, 6²=36, 7²=49. Recognizing square number patterns is a tested skill in PSEE number series questions.
Question 6: What comes next? 80, 40, 20, 10, ___
- 4
- 5 (Correct answer)
- 6
- 8
Correct answer: 5
Each term is halved: 80÷2=40, ..., 10÷2=5.
This is a geometric sequence with common ratio 1/2 (each term is divided by 2). 10 ÷ 2 = 5. Geometric sequences with fractional ratios are tested in PSEE number series problems.
PSEE Number Series 2
What is the next number in the series? 3, 6, 12, 24, 48, ___