# Aptitude Questions: Number Series Set 24

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. 15 30 52 83 125 178 ?
a) 235
b) 246
c) 255
d) 165
e) None of these
Explanation :
15 + (4^2 – 1) = 30
30 + (5^2 – 3) = 52
52 + (6^2 – 5) = 83
83 + (7^2 – 7) = 125
125 + (8^2 – 11) = 178
178 + (9^2 – 13) = 246

2. 10 20 20 60 90 360 ?
a) 240
b) 480
c) 640
d) 720
e) None of these
Explanation :
10*2 = 20
20*1 = 20
20*3 = 60
60*1.5 = 90
90*4 = 360
360*2 = 720

3. 50 26 14.5 9.25 7.125 ?
a) 6.3625
b) 6.5625
c) 6.6625
d) 7.6355
e) None of these
Explanation :
50*(1/2) + 1 = 26
26*(1/2) + 1.5 = 14.5
14.5*(1/2) + 2 = 9.25
9.25*(1/2) + 2.5 = 7.125
7.125*(1/2) + 3 = 6.5625

4. 10 49 243 1211 6047 ?
a) 30219
b) 21219
c) 31219
d) 28291
e) None of these
Explanation :
*5 -1, *5-2, *5 -4, *5 -8, *5 -16

5. 12 30 75 187.5 ? 1171.875
a) 458.75
b) 468.75
c) 442.75
d) 598.75
e) None of these
Explanation :
multiply each term by 2.5

6. 32 160 1120 4480 ?
a) 70670
b) 60250
c) 71680
d) 89120
e) None of these
Explanation :
32*(3+2) = 160
160*(1+6+0) = 1120
1120*(1+1+2+0) = 4480
4480*(4+4+8+0) = 71680

7. 64 66 72 88 128 ?
a) 256
b) 246
c) 224
d) 226
e) None of these
Explanation :
64 + (1*2) = 66
66 + (2*3) = 72
72 + (4*4) = 88
88 + (8*5) = 128
128 + (16*6) = 224

8. 36 39 48 63 84 111 ?
a) 141
b) 142
c) 143
d) 144
e) None of these
Explanation :
36 + 3*1 = 39
39 + 3*3 = 48
48 + 3*5 = 63
63 + 3*7 = 84
84 + 3*9 = 111
111 + 3*11 = 144

9. 11, 15, 42, 58, 183, 219 ?
a) 644
b) 244
c) 344
d) 562
e) None of these
Explanation :
11+2^2 = 15
15+3^3 = 42
42+4^2 = 58
58+5^3 = 183
183+6^2 = 219
219+7^3 = 562

10. 2160 1082 543 273.5 ?
a) 138.75
b) 148.75
c) 158.75
d) 168.75
e) None of these
Explanation :
2160/2 + 2 = 1082
1082/2 + 4 = 545
545/2 + 8 = 280.5
280.5/2 + 16 = 156.25

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