Important Number Series Questions for IBPS Clerk Pre Exam

number series
Directions (1-5): In the following number series, the only number is wrong. Find out the wrong number.

Ques 1.

54, 59, 63, 75, 99, 147

1. 54
2. 59
3. 75
4. 147
5. 99


2; The series is :
54 + 3 = 57 ≠ 59 
57 + 6 = 63
63 + 12 = 75
75 + 24 = 99
99 + 48 = 147

Ques 2.

3, 24, 147, 1029, 7203, 50421
1. 24
2. 1029
3. 3
4. 7203
5. 147

1; The series is 
3 x 7 = 21 ≠ 24
21 x 7 = 147
147 x 7 = 1029
1029 x 7 = 7203
7203 x 7 = 50,421

Ques 3.

9, 7, 23, 12.5, 29, 15
1. 12.5
2. 15
3. 23
4. 29
5. 7

3; The series is 
(9+5) x 1/2 = 7
(7+4) x 2 = 22  23
(22+3) x 1/2 = 12.5
(12.5 + 2  ) x 2 = 29
(29+1) x 1/2 = 15

  

Ques 4.

11, 13, 16, 21, 30, 41
1. 11
2. 16
3. 21
4. 42
5. 30

5; The series is 
11 + 2 = 13
13 + 3 = 16
16 + 5 = 21
21 + 8 = 29 30
30 + 12 = 42


Ques 5.

7, 28, 24, 56, 28, 112
1. 7
2. 56
3. 28
4. 24
5. 112

4; The series is :
7 x 4 = 28
28 ÷ 2 = 14 24
14 x 4 = 56
56 ÷ 2 = 28
28 x 4 = 112   


Direction (1-5): What value should come in place or question mark (?) in the following number series?

Ques 1.

2548, 1584, ?, 448, 180, 48
1. 1284
2. 1185
3. 900
4. 1294
5. 848

3; The series is:
14³ - 14² = 2548, 12³ - 12² = 1584, 10³ - 10² = 900
8³ - 8² = 448, 6³ = 180, 4³ - 4² = 48

Ques 2.

29, 173, 719, ?, 4391, 4415
1. 2183
2. 2483
3. 2238
4. 2583
5. 2538

1; The series is :
29 x 5 + (29-1) = 173, 173 x 4 + (29-2) = 719,
719 x 3 + (29-3) = 2183 , 2183 x 2 + (29-4) = 4391,
4391 x 1 + (29-5) = 4415

Ques 3.

85, 87, 47.5, 148.5, ?, 235.625
1. 69.25
2. 40.125
3. 60.125
4. 45.125
5. 75.25

4; The series is :
85 x 1 + 2 = 87, 87 ÷ 2 + 4 = 47.5 , 47.5 x 3 + 6 = 148.5,
148.5 ÷ 4+8 = 45.125 , 45.125 x 5 + 10 = 235.625

Ques 4.

18, 450, 434, 3906, ?, 3902
1. 3904
2. 3902
3. 3906
4. 3908
5. 3907

2; The series is 
18 x 5² = 450 , 450 - 4² = 434, 434 x 3² = 3906
3906 - 2² = 3902 , 3902 x 1² = 3902

Ques 5.

5832, 4096, 2744, 1725, ?
1. 729
2. 1000
3. 512
4. 1331
5. 1224
2; The series is :
18³ = 5832, 16³ = 4096, 14³ = 2744, 12³ = 1728,
10³ = 1000  


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