# Missing Numbers Quiz Set 025

### Question 1

Examine this series: 5, 12, 60, 340. If another series is written with the same rule, what number would come in the place E: 7, A, B, C, D, E ?

A

172

B

3224

C

1012

D

20164

Soln.
Ans: d

Number 20164 will come in place of (D). Rule is: 5 X 8 - 28 = 12, then 12 X 7 - 24 = 60, then 60 X 6 - 20 = 340, and so on. On this pattern, A = 7 X 8 - 28 = 28, B = 28 X 7 - 24 = 172, C = 172 X 6 - 20 = 1012, D = 1012 X 5 - 16 = 5044, E = 5044 X 4 - 12 = 20164.

### Question 2

In the following number series, one of the numbers does not fit into the series. Find the wrong number.

35, 118, 280, 600, 1238, 2504, 5036

A

118

B

280

C

600

D

1238

Soln.
Ans: d

Number 1238 is wrong and should be replaced by 1236. The differences in successive numbers are 83, 162, 320, 636, 1268, 2532. The differences in these are 79, 79 X 2 = 158, 158 X 2 = 316, 316 X 2 = 632, 632 X 2 = 1264, you can see how complicated is this series yourself!

### Question 3

Directions : One number is wrong in the series. Find out the wrong number.

3, 6, 9, 22.5, 67.5, 236.25, 945

A

6

B

9

C

22.5

D

67.5

Soln.
Ans: a

Pattern of the series is :

3 × 1.5 = 4.5, 4.5 × 2 = 9, 9 × 2.5 =22.5, 22.5 × 3 = 67.5, 67.5 × 3.5 = 236.5 . . . .

Therefore, number 6 should be replaced by 4.5 .

### Question 4

In the following number series, one of the numbers does not fit into the series. Find the wrong number.

4, 10, 22, 40, 84, 94, 130

A

22

B

40

C

64

D

84

Soln.
Ans: d

Number 84 is wrong and should be replaced by 64. The series is 4 + 6 = 10, then 10 + 2 X 6 = 22, then 22 + 3 X 6 = 40, then 40 + 4 X 6 should give 64, not 84.

### Question 5

5, 16, 49, 104, (?)

A

148.

B

170.

C

181.

D

115.

Soln.
Ans: c

5 (+ 11), 16 (+ 33), 49 (+ 55), 104 (+ 77), 181. 