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Number Series - Quantitative Aptitude Questions and Answers

Questions
6 Find out the wrong number from the following number series ?

484, 240, 120, 57, 26.5, 11.25, 3.625

A 240
B 120
C 26.5
D 11.25

Answer: Option [B]

The wrong number from the given series is 120. It is replaced by 118

484 x 0.5 - 2 = 240

240 x 0.5 - 2 = 118

118 x 0.5 - 2 = 57

and so on.....
7 Find out the wrong number from the following number series?

6, 10, 14, 34, 66, 130, 258

A 14
B 64
C 130
D 258

Answer: Option [A]

The wrong number from the given series is 14. It is replaced by 18

6 x 2 - 2 = 10

10 x 2 - 2 = 18

18 x 2 - 2 = 34

and so on...
8 Find out the wrong number from the following number series?

18, 20, 23, 32, 48, 73, 109

A 18
B 20
C 32
D 73

Answer: Option [B]

The wrong number from the given series is 20. It is replaced by 19

18 + 12

19 + 22

23 + 32

32 + 42

48 + 52

73 + 62

9 Find out the wrong number from the following number series?

5, 7, 16, 57, 244, 1245, 7506

A 244
B 57
C 7
D 5

Answer: Option [C]

The wrong number from the given series is 7. It is replaced by 6

5 x 1 + 12 = 6

6 x 2 + 22 = 16

16 x 3 + 32 = 57

57 x 4 + 42 = 244

244 x 5 + 52 = 1245

1245 x 6 + 62 = 7506

10 Find out the wrong number from the following number series?

99, 80, 64, 48, 35, 24

A 24
B 35
C 48
D 64

Answer: Option [D]

The wrong number from the given series is 64. It is replaced by 63

102 - 1 = 99

92 - 1 = 80

82 - 1 = 63

72 - 1 = 48

62 - 1 = 35

52 - 1 = 24

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