EIAT Number Series and Pattern Recognition 4

Question 1

What is the next number in the series: 3, 9, 27, 81, ___?

Accepted Answer

243

Answer

Each term is multiplied by 3, so 81 × 3 = 243.

Question 2

Find the missing number: 100, 91, 83, 76, 70, ___?

Accepted Answer

65

Answer

The differences are −9, −8, −7, −6, −5, so 70 − 5 = 65.

Question 3

What comes next in the pattern: 2, 6, 12, 20, 30, ___?

Accepted Answer

42

Answer

The differences are 4, 6, 8, 10, 12, so 30 + 12 = 42.

Question 4

An elevator makes trips between floors at intervals of 4, 8, 16, 32 seconds. What is the next interval?

Accepted Answer

64

Answer

Each interval doubles, so 32 × 2 = 64 seconds.

Question 5

What is the missing value: 5, 10, 20, ___, 80, 160?

Accepted Answer

40

Answer

Each term doubles, so 20 × 2 = 40.

EIAT - Elevator Industry Aptitude Test Practice Test