EIAT Number Series and Pattern Recognition 2

Question 1

What number comes next: 81, 27, 9, 3, ___?

Accepted Answer

1

Answer

Each term is divided by 3, so 3 ÷ 3 = 1.

Question 2

Find the missing number: 2, 6, 12, 20, ___, 42.

Accepted Answer

30

Answer

The differences increase by 2 each step (4, 6, 8, 10, 12), so 20 + 10 = 30.

Question 3

What comes next: 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 4

Find the next number: 3, 7, 15, 31, ___?

Accepted Answer

63

Answer

Each term follows the rule ×2 + 1, so 31 × 2 + 1 = 63.

Question 5

What is missing: 0, 1, 3, 6, 10, ___?

Accepted Answer

15

Answer

These are triangular numbers; differences increase by 1 each step, so 10 + 5 = 15.

EIAT - Elevator Industry Aptitude Test Practice Test