Odd man out and series

(41) Which number does not belong in the series: 6, 12, 18, 24, 32, 40, 50?

• (a) 18
• (b) 32
• (c) 40
• (d) 50

Answer

Correct Answer: (d) 50
The pattern is adding 6 to each number: 6, 12, 18, 24, 30, 36, 42, …
The number 50 does not fit this pattern.

(42) Look at this series: 1, 3, 8, 18, 38, … What number should fill the blank?

• (a) 46
• (b) 58
• (c) 68
• (d) 78

Answer

Correct Answer: (d) 78
This is a series where each number is multiplied by 2 and then increased by 2: 1, 3, 8, 18, 38, …
The next number should be \(38 \times 2 + 2 = 78\).

(43) Which number does not belong in the series: 14, 28, 42, 56, 70, 84, 100?

• (a) 42
• (b) 56
• (c) 70
• (d) 100

Answer

Correct Answer: (d) 100
The pattern is adding 14 to each number: 14, 28, 42, 56, 70, 84, 98, …
The number 100 does not fit this pattern.

(44) Look at this series: 4, 7, 12, 19, 28, … What number should fill the blank?

• (a) 35
• (b) 38
• (c) 43
• (d) 39

Answer

Correct Answer: (d) 39
The pattern is adding consecutive prime numbers: 3, 5, 7, 11, 13, 17, 19, …
The next number should be \(28 + 11 = 39\).

(45) Which number does not belong in the series: 5, 12, 21, 32, 45, 60, 77?

• (a) 21
• (b) 32
• (c) 45
• (d) 60

Answer

Correct Answer: (d) 60
The pattern is adding consecutive square numbers: 1^2, 2^2, 3^2, 4^2, 5^2, 6^2, …
The number 60 does not fit this pattern.