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Quantitative Aptitude Questions and Answers on Number Series

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Free download in pdf quantitative aptitude questions and answers for freshers on number series for UPSC, SSC, NDA, Railways, IBPS Bank PO, SBI PO, IBPS Clerical Exam.
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(1) Select the missing term from the following number series ?

13, 18 16, 21, 19, 24, ?

[A] 20
[B] 22
[C] 14
[D] 26

Comment

Answer: Option [B]

The missing term is 22

13 + 5 = 18

18 - 2 = 16

16 + 5 = 21

21 - 2 = 19

19 + 5 = 24

24 - 2 = 22

(2) Select the missing term from the following number series ?

1, 3, 6, 8, 16, 18, 36, 38, ?

[A] 80
[B] 72
[C] 76
[D] 32

Comment

Answer: Option [C]

The missing term is 76

1 + 2 = 3

3 x 2 = 6

6 + 2 = 8

8 x 2 = 16

16 + 2 = 18

18 x 2 = 36

36 + 2 = 38

38 x 2 = 76

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(3) Find the missing term from the following number series ?

4, 10, 40, 190, 940, ?, 23440

[A] 4125
[B] 4690
[C] 4875
[D] 4991

Comment

Answer: Option [B]

The missing term is 4690

4 + 6 x 50 = 10

10 + 6 x 51 = 40

40 + 6 x 52 = 190

190 + 6 x 53 = 940

940 + 6 x 54 = 4690

4690 + 6 x 55 = 23440

(4) Find the missing term from the following number series ?

7, 4, 5, 9, ?, 52.5, 160.5

[A] 16
[B] 18
[C] 20
[D] 22

Comment

Answer: Option [C]

The missing term is 20

7 x 0.5 + 0.5 = 4

4 x 1 + 1 = 5

5 x 1.5 + 1.5 = 9

9 x 2 + 2 = 20

20 x 2.5 + 2.5 = 52.5

52.5 x 3 + 3 = 160.5

(5) Find the missing term from the following number series ?

620, 632, 608, 644, 596, ?

[A] 670
[B] 664
[C] 658
[D] 656

Comment

Answer: Option [D]

The missing term is 656

620 + 12 = 632

632 - 24 = 608

608 + 36 = 644

644 - 48 = 596

596 + 60 = 656

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