EIAT Number Series and Pattern Recognition 3

Question 1

What comes next: 1, 2, 4, 7, 11, ___?

Accepted Answer

16

Answer

The differences increase by 1 each step (1, 2, 3, 4, 5), so 11 + 5 = 16.

Question 2

Find the missing number: 100, 95, 85, 70, ___?

Accepted Answer

50

Answer

The differences increase by 5 each step (5, 10, 15, 20), so 70 − 20 = 50.

Question 3

What is next in the series: 2, 3, 5, 7, 11, 13, ___?

Accepted Answer

17

Answer

This is the sequence of prime numbers; the next prime after 13 is 17.

Question 4

Find the next number: 1, 8, 27, 64, ___?

Accepted Answer

125

Answer

These are perfect cubes (1³, 2³, 3³, 4³), so the next is 5³ = 125.

Question 5

What comes next: 2, 4, 3, 9, 4, 16, 5, ___?

Accepted Answer

25

Answer

The sequence alternates between n and n²; after 5 comes 5² = 25.

EIAT - Elevator Industry Aptitude Test Practice Test