Number Series Model Questions Set 1 Section-Wise Topic Notes With Detailed Explanation And Example Questions
MOST IMPORTANT quantitative aptitude - 2 EXERCISES
The following question based on Number Series topic of quantitative aptitude
48, 72, 108, 162, 243, 366
(a) 108
(b) 243
(c) 72
(d) 162
e) None of these
The correct answers to the above question in:
Answer: (e)
The series is × 1.5
The wrong number is 366
It should be 243 × 1.5 = 364.5
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Read more model questions set 1 Based Quantitative Aptitude Questions and Answers
Question : 1
What should come in place of the question mark (?) in the following number series?
4, 15, 16, ?, 36, 63, 64
a) 30
b) 35
c) 25
d) 32
e) None of these
Answer »Answer: (b)
Pattern is $2^2$, $4^2$ – 1,$4^2$, $6^2$ – 1, $6^2$ and so on.
Question : 2
A wrong number is given in the following number series. Find out that wrong number.
2, 11, 38, 197, 1172, 8227, 65806
a) 38
b) 1172
c) 11
d) 197
e) 8227
Answer »Answer: (b)
The series is based on the following pattern:
2 × 3 + 5 = 11
11 × 4 – 6 = 38
38 × 5 + 7 = 197
197 × 6 – 8 = 1174 ; not 1172
1174 × 7 + 9 = 8227
8227 × 8 – 10 = 65806
Clearly, 1172 is the wrong number and it should be replaced by 1174.
Question : 3
What should come in place of the question mark (?) in the following number series?
5, 5, 15, 75, ?, 4725, 51975
a) 450
b) 300
c) 520
d) 525
e) None of these
Answer »Answer: (d)
The series is as follows:
× 1, × 3, × 5, × 7, × 9, × 11
Hence, ? = 75 × 7 = 525
Question : 4
What should come in place of the question mark (?) in the following number serie?
250, 100, 40, ?, 6.4, 2.56
a) 20
b) 12
c) 16
d) 24
e) None of these
Answer »Answer: (c)
The given number series is based on the following pattern:
$250_{÷2.5}$ $100_{÷2.5}$ $40_{÷2.5}$ $16_{÷2.5}$ $6.4_{÷2.5}$ 2.56
Hence, the number 16 will replace the question mark.
Question : 5
What should come in place of the question mark (?) in the following number serie?
4, 16, 36, 64, 100, ?
a) 180
b) 144
c) 120
d) 136
e) None of these
Answer »Answer: (b)
The series is as follows
$(2)^2$, $(4)^2$, $(6)^2$, $(8)^2$, $(10)^2$, $(12)^2$
Hence, ? = $(12)^2$ = 144
Question : 6
What should come in place of the question mark (?) in the following number serie?
12, 6.5, 7.5, 12.75, 27.5, 71.25, ?
a) 216.75
b) 236.75
c) 225.75
d) 209.75
e) 249.75
Answer »Answer: (a)
The given number series is based on the following pattern:
12 × 0.5 + 0.5 = 6.5
6.5 × 1 + 1 = 7.5
7.5 × 1.5 + 1.5 = 12.75
12.75 × 2 + 2 = 27.5
27.5 × 2.5 + 2.5 = 71.25
∴ ? = 71.25 × 3 + 3
= 213.75 + 3 = 216.75
Hence, 216.75 will replace the question mark.
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