# Aptitude - Number Series

### MCQ

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Q 21.

2, 9, 28, 65, 126, x

Options:

• 195

• 199

• 208

• 217

Q 22.

10000, 2000, 400, 80, 16, 3.2, x

Options:

• 0.38

• 0.45

• 0.64

• 0.54

Q 23.

2, 8, 18, x, 50, 72

Options:

• 32

• 33

• 36

• 38

Q 24.

4, 12, 36, x, 324, 972

Options:

• 108

• 125

• 215

• 312

Q 25.

6, x, 21, 33, 48

Options:

• 12

• 14

• 16

• 18

Q 26.

Find the value of Y in the given series.

6,  9, 18, 45, 135

20, W,   X,  Y,  450

Both the series follow the same pattern.

Options:

• 130

• 140

• 150

• 160

Pattern

1st series: 6 -------- 9 -------- 18 ----------- 45 ----------- 135

x1.5        x2             x2.5             x3

2nd series: 20 ------ W -------- X ----------- Y ------------- Z

30           60              150               450

W = 20 x 1.5

X = W x 2

Y = X x 2.5

Q 27.

Find the value of R in the series 21, 25, 34, 50, R, 111.

Options:

• 65

• 75

• 85

• 95

Pattern

21+22 = 25

25+32 = 34

34+42 = 50

50+52 = 75

75+62 = 111

So, value of R is 75.

Q 28.

Find the odd one out in the series 19, 29, 40, 44, 51, 59.

Options:

• 40

• 44

• 51

• 59

Pattern

Given: 19 -------- 29 --------- 40 --------- 44 ----------- 51 ---------- 59

+(1+9)     +(2+9)      +(4+0)       +(4+4)        +(5+2)

Result: 19 ------- 29 --------- 40 ---------- 44 ---------- 52 ----------- 59

So, 51 is the odd one.

Q 29.

Find the odd one out in the series 4, 2, 3.5, 7.5, 26,25.

Options:

• 2

• 3.5

• 7.5

• 26.25

Pattern

First term = 4

Second term = 4x0.5 = 2

Third term = 2x1.5 = 3

Fourth term = 3x2.5 = 7.5

Fifth term = 7.5x3.5 = 26.25

So, 3.5 is the odd one.

Q 30.

Find the odd one out in the given series 2, 11, 38, 197, 1172.

Options:

• 11

• 38

• 197

• 1172

Pattern

First term = 2

Second term = 2x3+5 = 11

Third term = 11x4-6 = 38

Fourth term = 38x5+7 =197

Fifth term = 197x6-8 =1174

So, 1172 is the odd one.

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