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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