EIAT Number Series and Pattern Recognition 2 — Questions and Answers
Question 1: What number comes next: 81, 27, 9, 3, ___?
Correct answer: 1
Each term is divided by 3, so 3 ÷ 3 = 1.
Question 2: Find the missing number: 2, 6, 12, 20, ___, 42.
- 28
- 29
- 30 (Correct answer)
- 32
Correct answer: 30
The differences increase by 2 each step (4, 6, 8, 10, 12), so 20 + 10 = 30.
Question 3: What comes next: 1, 4, 9, 16, 25, ___?
- 30
- 34
- 36 (Correct answer)
- 49
Correct answer: 36
These are perfect squares (1², 2², 3², 4², 5²), so the next is 6² = 36.
Question 4: Find the next number: 3, 7, 15, 31, ___?
- 47
- 55
- 59
- 63 (Correct answer)
Correct answer: 63
Each term follows the rule ×2 + 1, so 31 × 2 + 1 = 63.
Question 5: What is missing: 0, 1, 3, 6, 10, ___?
- 14
- 15 (Correct answer)
- 16
- 18
Correct answer: 15
These are triangular numbers; differences increase by 1 each step, so 10 + 5 = 15.
Question 6: What comes next: 48, 24, 12, 6, ___?
Correct answer: 3
Each term is halved, so 6 ÷ 2 = 3.
Question 7: Find the next number: 5, 11, 23, 47, ___?
- 91
- 93
- 95 (Correct answer)
- 97
Correct answer: 95
Each term follows the rule ×2 + 1, so 47 × 2 + 1 = 95.
