PI Number Series Problems 3

Question 1

What is the next number: 5, 10, 8, 16, 14, 28, ___?

Accepted Answer

26

Answer

The pattern alternates: ×2 then −2, so 28 − 2 = 26.

Question 2

Find the missing number: 4, 9, 16, 25, ___, 49

Accepted Answer

36

Answer

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, ___

Accepted Answer

125

Answer

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, ___?

Accepted Answer

17

Answer

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, ___?

Accepted Answer

70

Answer

The pattern alternates −5 and +10, so after 55 the next step is +10 = 65.

PI - Cognitive Assessment Practice Test