IBEW Aptitude Number Series Question and Answers 2

Question 1

What is the next number in the series: 3, 6, 12, 24, 48, ___?

Accepted Answer

96

Answer

Each term is multiplied by 2: 3×2=6, 6×2=12, 12×2=24, 24×2=48, 48×2=96.

Question 2

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

Accepted Answer

65

Answer

The differences are -9, -8, -7, -6, -5. Each step the subtracted amount decreases by 1. 70 - 5 = 65.

Question 3

What comes next: 2, 5, 10, 17, 26, ___?

Accepted Answer

37

Answer

The differences are 3, 5, 7, 9 — odd numbers increasing by 2. The next difference is 11, so 26 + 11 = 37.

Question 4

Identify the next term: 1, 1, 2, 3, 5, 8, 13, ___

Accepted Answer

21

Answer

This is the Fibonacci sequence: each term is the sum of the two preceding terms. 8 + 13 = 21.

Question 5

What is the missing value: 81, 27, 9, 3, ___?

Accepted Answer

1

Answer

Each term is divided by 3: 81÷3=27, 27÷3=9, 9÷3=3, 3÷3=1.

IBEW - Aptitude Test Practice Test