Odd Man Out and Series

1) 3, 5, 11, 14, 17, 21
(A) 21
(B) 17
(C) 14
(D) 3

Answer: Option C
Explanation: Each of the number except 14 is an odd number.

2) 8, 27, 64, 100, 125, 216, 343
(A) 27
(B) 100
(C) 125
(D) 343

Answer: Option B
Explanation: The pattern is 2³, 3³, 4³, 5³, 6³, 7³. But 100 is not a perfect cube.

3)
10, 25, 45, 54, 60, 75, 80 (A) 10
(B) 45
(C) 54
(D) 75

Answer: Option C
Explanation: Each of the numbers except 54 is a multiple of 5.

4) 396, 462, 572, 396, 427, 671, 264
(A) 396
(B) 427
(C) 671
(D) 264

Answer: Option B
Explanation: Each of the numbers except 427, the middle digit is the sum of other two.

5) 6, 9, 15, 21, 24, 28, 30
(A) 28
(B) 21
(C) 24
(D) 30

Answer: Option A
Explanation: Each of the numbers except 28 is a multiple of 3.

6) 1, 4, 9, 16, 23, 25, 36
(A) 9
(B) 23
(C) 25
(D) 36

Answer: Option B
Explanation: Each of the numbers except 23 is a perfect square.

7) 1, 4, 9, 16, 20, 36, 49
(A) 1
(B) 9
(C) 20
(D) 49

Answer: Option C
Explanation: The pattern is 1², 2², 3², 4², 5², 6², 7². But instead of 5² it is 20 which is to be turned out.

8) 2, 5, 10, 17, 26, 37, 50, 64
(A) 50
(B) 26
(C) 37
(D) 64

Answer: Option D
Explanation: (1*1)+1, (2*2)+1, (3*3)+1, (4*4)+1, (5*5)+1, (6*6)+1, ...