PI Number Series Problems 3 — Questions and Answers
Question 1: What is the next number: 5, 10, 8, 16, 14, 28, ___?
- 24
- 26 (Correct answer)
- 30
- 56
Correct answer: 26
The pattern alternates: ×2 then −2, so 28 − 2 = 26.
Question 2: Find the missing number: 4, 9, 16, 25, ___, 49
- 30
- 32
- 36 (Correct answer)
- 40
Correct answer: 36
The series is perfect squares (2², 3², 4², 5², 6², 7²), so the missing term is 6² = 36.
Question 3: Complete the series: 1, 8, 27, 64, ___
- 100
- 115
- 125 (Correct answer)
- 144
Correct answer: 125
The series is perfect cubes (1³, 2³, 3³, 4³, 5³), so the next is 5³ = 125.
Question 4: What comes next: 2, 3, 5, 7, 11, 13, ___?
- 14
- 15
- 17 (Correct answer)
- 19
Correct answer: 17
These are consecutive prime numbers, and the next prime after 13 is 17.
Question 5: Find the next term: 50, 45, 55, 50, 60, 55, ___?
- 60
- 65
- 70 (Correct answer)
- 75
Correct answer: 70
The pattern alternates −5 and +10, so after 55 the next step is +10 = 65.
Question 6: What is the missing number: 6, 11, 21, 41, ___, 161?
- 61
- 71
- 81 (Correct answer)
- 91
Correct answer: 81
Each term is found by doubling the previous term and subtracting 1: 41×2−1 = 81.
Question 7: What comes next: 1, 4, 9, 16, 25, 36, ___?
- 42
- 45
- 49 (Correct answer)
- 54
Correct answer: 49
These are perfect squares (n²), so the next is 7² = 49.
PI Number Series Problems 3
What is the next number: 5, 10, 8, 16, 14, 28, ___?