# Important Number Series Questions for IBPS Clerk Exam - Part 1

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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