CCAT Number Series Patterns 5

Question 1

What comes next? 17, 14, 11, 8, 5, ___

Accepted Answer

2

Answer

Each term decreases by 3, so 5 − 3 = 2.

Question 2

What comes next? 1, 2, 6, 24, 120, ___

Accepted Answer

720

Answer

These are factorials: 1!, 2!, 3!, 4!, 5!, so next is 6! = 720.

Question 3

What comes next? 3, 7, 15, 31, 63, ___

Accepted Answer

127

Answer

Each term is doubled then 1 is added: 63 × 2 + 1 = 127.

Question 4

What comes next? 50, 48, 44, 38, 30, ___

Accepted Answer

20

Answer

Differences increase by 2 each step: −2, −4, −6, −8, −10, so 30 − 10 = 20.

Question 5

What comes next? 6, 12, 10, 20, 18, 36, 34, ___

Accepted Answer

68

Answer

The pattern alternates: ×2, −2, ×2, −2…, so 34 × 2 = 68.

CCAT Practice Test