**Number Series Questions for SBI PO PDF:**

Number Series Questions for SBI PO PDF

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**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

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**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

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

**1) Answer (E)**

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.

**2) Answer (D)**

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

**3) Answer (B)**

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

**4) Answer (A)**

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

**5) Answer (C)**

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

**6) Answer (A)**

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

**7) Answer (A)**

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

**8) Answer (A)**

The pattern followed is :

402 − (1 × 2) = 400

400 − (3 × 4) = 388

388 − (5 × 6) = 358

358 − (7 × 8) = 302

302 − (9 × 10) = 212

**9) Answer (B)**

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

**10) Answer (C)**

The pattern followed is :

8 × 1 − 2.5 = 5.5

5.5 × 2 − 2.5 = 8.5

8.5 × 3 − 2.5 = 23

23 × 4 − 2.5 = 89.5

89.5 × 5 − 2.5 = 445