CFAT Problem Solving: Number Series 2

Question 1

What is the next number in the series: 3, 7, 11, 15, 19, ?

Accepted Answer

23

Answer

Each term increases by 4, so 19 + 4 = 23.

Question 2

What comes next: 2, 6, 18, 54, ?

Accepted Answer

162

Answer

Each term is multiplied by 3, so 54 × 3 = 162.

Question 3

Find the missing number: 100, 90, 81, 73, 66, ?

Accepted Answer

60

Answer

The differences decrease by 1 each step (−10, −9, −8, −7, −6), so 66 − 6 = 60.

Question 4

What is the next term: 1, 4, 9, 16, 25, ?

Accepted Answer

36

Answer

These are perfect squares (1², 2², 3², 4², 5²), so the next is 6² = 36.

Question 5

Which number comes next: 5, 10, 8, 16, 14, ?

Accepted Answer

28

Answer

The pattern alternates between ×2 and −2; 14 × 2 = 28.

(CFAT) Canadian Forces Aptitude Test Practice Test