# Number Series Questions for SBI PO PDF

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Number Series Questions for SBI PO PDF:

You can practice Banking Previous year solved papers

Instructions: In the following number series only one number is wrong. Find out the wrong number.

Question 1: 11, 18, 29, 42, 59, 80, 101

a) 42
b) 18
c) 29
d) 59
e) None of these

Question 2: 2, 9, 32, 105, 436, 2195, 13182

a) 436
b) 2195
c) 9
d) 32
e) None of these

Question 3: 5, 55, 495, 3465, 17325, 34650, 51975,

a) 495
b) 34650
c) 55
d) 17325
e) None of these

Question 4: 3, 7, 16, 32, 56, 93, 142

a) 56
b) 16
c) 32
d) 7
e) None of these

Question 5: 4, 5, 12, 38, 160, 805, 4836

a) 12
b) 160
c) 38
d) 805
e) None of these

Instructions: What will come in place of the question mark (?) in each of the following number series.

Question 6: 158, 78, 38, 18, 8, ?

a) 3
b) 5
c) 2
d) 7
e) 6

Question 7: 16, 19, 24, 33, 50, ?

a) 83
b) 66
c) 99
d) 74
e) 102

Question 8: 402, 400, 388, 358, 302, ?

a) 212
b) 236
c) 190
d) 182
e) 210

Question 9: 31, 15, 21, 50, ?, 767.25

a) 160.5
b) 171.5
c) 156.5
d) 122.5
e) 143.5

Question 10: 8, 5.5, 8.5, 23, 89.5, ?

a) 455
b) 420.5
c) 445
d) 415.5
e) 433

Answer & Solutions for Number Series Questions for SBI PO PDF:

Prime numbers starting from 7 are added.
11 + 7 = 18
18 + 11 = 29
29 + 13 = 42
42 + 17 = 59
59 + 19 = 78
78 + 23 = 101
Hence, the number which is wrong is 80, as it is not in the options given, the correct answer is None of the above.

The pattern followed is :
2 × 1 + (1 × 7) = 9
9 × 2 + (2 × 6) = 30
30 × 3 + (3 × 5) = 105
105 × 4 + (4 × 4) = 436
436 × 5 + (5 × 3) = 2195
2195 × 6 + (6 × 2) = 13182

Consecutive odd numbers starting from 11 in decreasing order are multiplied.
5 × 11 = 55
55 × 9 = 495
495 × 7 = 3465
3465 × 5 = 17325
17325 × 3 = 51975
51975 × 1 = 51975

Squares of natural numbers are added.
3 $+ 2^2$ = 7
7 $+ 3^2$ = 16
16 $+ 4^2$ = 32
32 $+ 5^2$ = 57
57 $+ 6^2$ = 93
93 $+ 7^2$ = 142

The pattern followed is :
4 × 1 + 1 = 5
5 × 2 + 2 = 12
12 × 3 + 3 = 39
39 × 4 + 4 = 160
160 × 5 + 5 = 805
805 × 6 + 6 = 4836

Each number is divided by 2 and then 1 is subtracted.
158 ÷ 2 − 1 = 78
78 ÷ 2 − 1 = 38
38 ÷ 2 − 1 = 18
18 ÷ 2 − 1 = 8
8 ÷ 2 − 1 = 3

The pattern is :
16 + 3 = 19
19 + 5 (= 3 + 2) = 24
24 + 9 (= 5 + 4) = 33
33 + 17 (= 9 + 8) = 50
50 + 33 (= 17 + 16) = 83

The pattern followed is :
402 − (1 × 2) = 400
400 − (3 × 4) = 388
388 − (5 × 6) = 358
358 − (7 × 8) = 302
302 − (9 × 10) = 212

The pattern followed is :
31 × 0.5 − 0.5 = 15
15 × 1.5 − 1.5 = 21
21 × 2.5 − 2.5 = 50
50 × 3.5 − 3.5 = 171.5
171.5 × 4.5 − 4.5 = 767.25