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.
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