Practice Sets on Number Series | IBPS PO Mains Spl – Download in PDF:
Dear Readers, Here we have given the important practice set questions on Number Series, aspirants those who are preparing for the examination.
Directions (1 – 10): What should come in place of the question mark (?) in the following number series?
1).7 5 7 17 63 ?
a) 308
b) 302
c) 309
d) 409
e) 390
2).50 ? 61 89 154 280
a) 52
b) 51
c) 60
d) 62
e) 60
3).17 19 25 37 ? 87
a) 47
b) 37
c) 57
d) 67
e) 75
4).11 14 19 28 43 ?
a) 55
b) 44
c) 77
d) 88
e) 66
5).26 144 590 1164 ?
a) 1296
b) 1182
c) 2059
d) 1182
e) 1181
6).2916 972 ? 108 36 12
a) 324
b) 234
c) 248
d) 391
e) None of these
7).8, 27, 125, ?, 1331
a) 512
b) 216
c) 81
d) 343
e) 169
8).2 11 30 97 ? 1975
a) 325
b) 360
c) 34
d) 394
e) 376
9).8 47 234 935 ? 5607
a) 2804
b) 2802
c) 2808
d) 2801
e) 2804
10).6 9 15 27 51 ?
a) 84
b) 75
c) 99
d) 123
e) None of the above
Directions (11 – 20): In each of the following number series, a wrong number is given. Find out that number.
11).4, 5, 18, 80, 388, 2065, 12606
a) 5
b) 18
c) 80
d) 388
e) 2065
12).22, 51, 88, 133, 186, 248, 316
a) 51
b) 88
c) 133
d) 186
e) 248
13).7, 9, 21, 57, 137, 284, 539
a) 9
b) 21
c) 57
d) 137
e) 284
14).3, 17, 83, 371, 1907, 11507, 80627
a) 17
b) 83
c) 371
d) 1907
e) 11507
15).8, 9, 25, 105, 362, 987, 2283
a) 9
b) 25
c) 105
d) 362
e) 987
16).5531, 5506, 5425, 5304, 5135, 4910, 4621
a) 5531
b) 5425
c) 4621
d) 5135
e) 5506
17).6 7 9 13 26 37 69
a) 7
b) 26
c) 69
d) 37
e) 9
18).1 3 10 36 152 760 4632
a) 3
b) 36
c) 4632
d) 760
e) 152
19).4 3 9 34 96 219 435
a) 4
b) 9
c) 34
d) 435
e) 219
20).157.5 45 15 6 3 2 1
a) 1
b) 2
c) 6
d) 157.5
e) 45
Answer Key with Solutions:
1. C)309
7 x 1 – 2 = 5
5 x 2 – 3 = 7
7 x 3 – 4 = 17
17 x 4 – 5 = 63
63 x 5 – 6 = 309
2. A)52
50..50+(1^3+1) = 52
52+(2^3+1)=61.
61+(3^3+1)=89
89+(4^3+1)=154
154 + (5^3+1) = 280
3. C)57
17 + 1 x 2 = 19
19 + 2 x 3 = 25
25 + 3 x 4 = 37
37 + 4 x 5 = 57
57 + 5 x 6 = 87
4. E)66
3….5…9…15…23
…2….4….6….8…
Answer 43+23= 66
5. B)1182
26 x 6 – 12 = 144
144 x 4 + 14 = 590
590 x 2 – 16 = 1164
1164 x 1 + 18 = 1182
6. A)324
2916/3 = 972
972/3 = 324
324/3 = 108
108/3 = 36
36/3 = 12
7. D)343
Cube prime series 23, 33, 53, 73, 113
8. D)
2 x 1 + 9 = 11 x 2 + 8 = 30 x 3 + 7 = 97 x 4 + 6 = 394
9. A)
x 6 – 1, x 5 – 1, x 4 – 1, x 3 – 1 = 935 x 3 – 1 = 2804
10. C)
+3, +6, +12, +24, +48 = 51 + 48 = 99
16. A)
Here the sequence can be achieved by -72, -92, -112, -132, 152, 172, ……………
17. B)
Here the sequence can be achieved by adding +1, +2, +4, +8, +16, +32
18. D)
Here the sequence can be achieved by x1 + 2, x 2 + 4, x 3 + 6, x 4 + 8, x 5 + 10, ………
19. A)
Here the sequence can be achieved by adding 02 + 4, 12+ 2, 32+ 0, 62 – 2, 102 – 4, 152 – 6, …..
Hence 435 should be replaced with 433
20. A)
Here the sequence can be achieved by 3.5, 3, 2.5, 2, 1.5, 1, …………….
