RBI Assistant Free Number Series Questions

RBI Assistant Free Number Series Questions: Enjoy some free number series questions today. Make them count and reach for the stars.

Numbers Series (Quant):

Question 1: The following numbers form a series. Find the odd one out.

4, 3, 4, 9, 13, 155

a) 3

b) 4

c) 13

d) 155

e) 9

Answer: c

Solution:

4 × 1 – 1 = 3

3 × 2 – 2 = 4

4 × 3 – 3 = 9

9 × 4 – 4 = 32

32 × 5 – 5 = 155

So, 32 will come in the place of 13.

Hence, option c.

Question 2: The following numbers form a series. Find the odd one out.

34, 36, 26, 51, 2, 83

a) 51

b) 36

c) 2

d) 83

e) 26

Answer: b

Solution:

34 + 1² = 35

35 – 3² = 26

26 + 5² = 51

51 – 7² = 2

2 + 9² = 83

So, 35 will come in the place of 36.

Hence, option b.

Question 3: The following numbers form a series. Find the odd one out.

945, 210, 60, 24, 16, 8

a) 210

b) 16

c) 60

d) 8

e) 24

Answer: d

Solution: 

945/ 4.5 = 210

210/ 3.5 = 60

60/2.5 = 24

24/1.5 = 16

16/0.5 = 32

So, 32 will come in the place of 8.

Hence, option d.

Question 4: The following numbers form a series. Find the odd one out.

54, 70, 58, 77, 62, 81

a) 70
b) 77

c) 58

d) 54

e) 62

Answer: a

Solution:

54 + 19 = 73

73 – 15 = 58

58 + 19 = 77

77 – 15 = 62

62 + 19 = 81

So, 73 will come in the place of 70.

Hence, option a.

Question 5: The following numbers form a series. Find the odd one out.

32, 38, 49, 67, 90, 132

a) 67

b) 90

c) 32

d) 38

e) 49

Answer: b

Solution:

32 + 6 = 38

38 + 11 = 49

49 + 18 = 67

67 + 27 = 94

94 + 38 = 132

So, 94 will come in the place of 90.

Hence, option b.

Question 6: What will come in place of the question mark (?) in the following series?

24, 94, 157, 213, ? 304

a) 284

b) 262

c) 296

d) 246

e) 256

Answer: b

Solution:

24 + 70 = 94

94 + 63 = 157

157 + 56 = 213

213 + 49 = 262

262 + 42 = 304

Hence, option b.

Question 7: What will come in place of the question mark (?) in the following series?

14, 15.2, 16.8, 19.2, 22.8, ?

a) 28

b) 27.6

c) 28.8

d) 27.2

e) 29.6

Answer: a

Solution:

Hence, option a.

Question 8: What will come in place of the question mark (?) in the following series?

16, ?, 48, 240, 1680, 15120

a) 20

b) 36

c) 20

d) 24

e) None of these

Answer: e)

Solution: 

16 × 1 = 16

16 × 3 = 48

48 × 5 = 240

240 × 7 = 1680

1680 × 9 = 15120

Hence, option e.

Question 9: What will come in place of the question mark (?) in the following series?

78, 59, 42, ?, 18, 11

a) 24

b) 26

c) 32

d) 29

e) 35

Answer: d

Solution:

78 – 19 = 59

59 – 17 = 42

42 – 13 = 29

29 – 11 = 18

18 – 7 = 11

Hence, option d.

Question 10: What will come in place of the question mark (?) in the following series?

15, 8, 9, 15, ?, 82.5

a) 20

b) 32

c) 24

d) 27

e) 36

Answer: b

Solution:

15 × 0.5 + 0.5 = 8

8 × 1 + 1 = 9

9 + 1.5 + 1.5 = 15

15 × 2 + 2 = 32

32 × 2.5 + 2.5 = 82.5

Hence, option b.