PI - Cognitive Assessment Number Series Problems 3

Question 1

What comes next: 7, 11, 16, 22, 29, ___?

Accepted Answer

37

Answer

The differences increase by 1 each time: +4, +5, +6, +7, +8. So 29+8=37.

Question 2

What comes next: 2, 3, 5, 7, 11, 13, ___?

Accepted Answer

17

Answer

These are consecutive prime numbers. The next prime after 13 is 17.

Question 3

What comes next: 1, 3, 7, 15, 31, ___?

Accepted Answer

63

Answer

Each term is double the previous plus 1: 1×2+1=3, 3×2+1=7, 7×2+1=15, 15×2+1=31, 31×2+1=63.

Question 4

What comes next: 4, 5, 8, 13, 20, ___?

Accepted Answer

29

Answer

The differences increase by 2: +1, +3, +5, +7, +9. So 20+9=29.

Question 5

What comes next: 1000, 500, 250, 125, ___?

Accepted Answer

62.5

Answer

Each number is halved: 1000÷2=500, 500÷2=250, 250÷2=125, 125÷2=62.5.

PI - Cognitive Assessment Practice Test