Aptitude - Number Series

MCQ

Q 21.

2, 9, 28, 65, 126, x

Q 22.

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

0.38
0.45
0.64
0.54

Q 23.

2, 8, 18, x, 50, 72

Q 24.

4, 12, 36, x, 324, 972

Q 25.

6, x, 21, 33, 48

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.

Explanation

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.

Explanation

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.

Explanation

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.

2
3.5
7.5
26.25

Explanation

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.

11
38
197
1172

Explanation

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.

Q 31.

Find the value of S in the series 4, 19, 49, S, 229

Explanation

Pattern

Given: 4 ---- 19 ---- 49 ---- S ---- 229

+15 +30 +60 +120

Result: 4 ---- 19 ---- 49 ----- 109 ----- 229

So, value of S is 109

Q 32.

Find the value of Q in the given series: 840, Q, 420, 140, 35.

Explanation

Pattern

Given: 840 ---- Q ---- 420 ---- 140 ---- 35

840/1 Q/2 420/3 140/4

Output: 840 ---- 840 ---- 420 ---- 140 ---- 35

So, value of Q = 840

Q 33.

Find the odd one out in the given series. 14, 28, 112, 672, 5374.

28
112
672
5374

Explanation

Pattern

Given: 14 ---- 28 ---- 112 ---- 672 ---- 5374

x2 x4 x6 x8

Output: 14 ---- 28 ---- 112 ---- 672 ---- 5376

So, 5374 is the odd one.

Q 34.

Find the value of Z in the series 3, 5, 9, 17, 33, Z

Explanation

Pattern

3 ---- 5 ---- 9 ---- 17 ---- 33 ---- Z

+2 +4 +8 +16 +32

Q 35.

Find the value of P in the given series: 2, 8, 18, P, 50

Explanation

Series pattern is (2x1²) , (2x2²), (2x3²), (2x4²), (2x5²)