# Aptitude Questions: Number Series Set 25

Hello Aspirants. Welcome to Online Quantitative Aptitude Section in AffairsCloud.com. Here we are creating question sample in Number Series, which is common for all the competitive exams. We have included Some questions that are repeatedly asked in bank exams !!!

Questions Penned by Yogit

1. 17 36 52 63 67 ?
a) 71
b) 72
c) 62
d) 63
e) None of these
Explanation :
17 + (5*4 -1) = 36
36 + (5*4 – 4) = 52
52 + (5*4 – 9) = 63
63 + (5*4 – 16) = 67
67 + (5*4 – 25) = 62

2. 10 28 64 115 175 ?
a) 252
b) 272
c) 232
d) 300
e) None of these
Explanation :
10 + (21 – 3) = 28
28 + (42 – 6) = 64
64 + (63 – 12) = 115
115 + (84 – 24) = 175
175 + (105 – 48) = 232

3. 100 104 95 111 86 ?
a) 112
b) 122
c) 132
d) 142
e) None of these
Explanation :
100 + 2^2 = 104
104 – 3^2 = 95
95 + 4^2 = 111
111 – 5^2 =  86
86 + 6^2 = 122

4. 50 53 59 73 105 ?
a) 165
b) 175
c) 185
d) 195
e) None of these
50 + (5 -2) = 53
53 + (10 – 4) = 59
59 + (20 – 6) = 73
73 + (40 – 8) = 105
105 + (80 -10) = 175

5. 17 32 93 368 ?
a) 1735
b) 1835
c) 1935
d) 1995
e) None of these
Explanation :
17*2 – 2 = 32
32*3 – 3 = 93
93*4 – 4 = 368
368*5 – 5 = 1835

6. 64 72 79 93 103 ?
a) 104
b) 105
c) 107
d) 110
e) None of these
Explanation :
64 + (6+4 – 2) = 72
72 + (7 +2 – 2) = 79
79 + (7 + 9 – 2 ) = 93
93 + (9 + 3 -2) = 103
103 + (1 +0 +3 -2) = 105

7. 20 31 31 53 57 90 ?
a) 95
b) 96
c) 98
d) 92
e) 100
Explanation :
20 + 11 = 31
31 + 0 = 31
31 + 22 = 53
53 + 4 = 57
57 + 33 = 90
90 + 8 = 98

8. 5 20 53 112 205 ?
a) 320
b) 330
c) 340
d) 350
e) None of these
Explanation :
5 + (4^2 – 1) = 20
20 + (6^2 -3) = 53
53 + (8^2 -5) = 112
112 + (10^2 – 7) = 205
205 +(12^2 – 9) = 340

9. 20 20 10 30 7.5 ?
a) 32.5
b) 37.5
c) 41.25
d) 43.25
e) None of these
Explanation :
20*1 = 20
20 ÷ 2 = 10
10 * 3 = 30
30 ÷4 = 7.5
7.5 * 5 = 37.5

10. 64 66 72 88 128 ?
a) 256
b) 246
c) 224
d) 226
e) None of these