PI Number Series Problems 5 — Questions and Answers
Question 1: What is the next number: 1, 2, 4, 7, 11, 16, ___?
- 20
- 21
- 22 (Correct answer)
- 23
Correct answer: 22
Differences are 1, 2, 3, 4, 5, 6 — increasing by 1, so 16 + 6 = 22.
Question 2: Find the missing number: 512, 256, 128, ___, 32
- 48
- 56
- 64 (Correct answer)
- 96
Correct answer: 64
Each term is halved, so 128 ÷ 2 = 64, and 64 ÷ 2 = 32 confirms it.
Question 3: Complete the series: 1, 3, 7, 15, 31, ___
- 47
- 55
- 63 (Correct answer)
- 71
Correct answer: 63
Each term follows the rule 2n − 1 (or: ×2 +1), so 31 × 2 + 1 = 63.
Question 4: What comes next: 9, 16, 25, 36, 49, ___?
- 56
- 60
- 64 (Correct answer)
- 81
Correct answer: 64
These are perfect squares starting at 3², and the next is 8² = 64.
Question 5: Find the next term: 5, 7, 12, 19, 31, ___?
- 42
- 48
- 50 (Correct answer)
- 55
Correct answer: 50
Each term is the sum of the two preceding terms, so 19 + 31 = 50.
Question 6: What is the missing number: 1000, 200, 40, ___, 1.6?
- 4
- 8 (Correct answer)
- 10
- 16
Correct answer: 8
Each term is divided by 5, so 40 ÷ 5 = 8, and 8 ÷ 5 = 1.6 confirms it.
Question 7: What comes next: 3, 5, 8, 13, 21, 34, ___?
- 47
- 53
- 55 (Correct answer)
- 58
Correct answer: 55
Each term is the sum of the two previous terms (Fibonacci-type), so 21 + 34 = 55.
PI Number Series Problems 5
What is the next number: 1, 2, 4, 7, 11, 16, ___?