Practice Model questions set 1 - quantitative aptitude Online Quiz (set-1) For All Competitive Exams
Q-1) What should come in place of the question mark (?) in the following number series?
8, 15, 28, 53, ?
(a)
(b)
(c)
(d)
(e)
Let x = 8
then 15 = 2x – 1 = y
28 = 2y – 2 = z
53 = 2z – 3 = m
Next term in the pattern should be
2m – 4 = 2 × 53 – 4
= 102
Q-2) What should come in place of the question mark (?) in the following number serie?
250, 100, 40, ?, 6.4, 2.56
(a)
(b)
(c)
(d)
(e)
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.
Q-3) What should come in place of the question mark (?) in the following number series?
4, 15, 16, ?, 36, 63, 64
(a)
(b)
(c)
(d)
(e)
Pattern is $2^2$, $4^2$ – 1,$4^2$, $6^2$ – 1, $6^2$ and so on.
Q-4) A wrong number is given in the following number series. Find out that wrong number.
2, 11, 38, 197, 1172, 8227, 65806
(a)
(b)
(c)
(d)
(e)
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.
Q-5) What should come in place of the question mark (?) in the following number series?
2, 3, 10, 15, 26, ?, 55
(a)
(b)
(c)
(d)
(e)
The series exhibits the pattern of $n^2$ + 1, $n^2$ – 1,
alternatively, n taking values 1, 2.............1
Q-6) What should come in place of the question mark (?) in the following number serie?
13, 20, 14, 19, 15, ?
(a)
(b)
(c)
(d)
(e)
Hence, question mark (?) should be replaced by 18.
Q-7) What should come in place of the question mark (?) in the following number series?
0, 7, 26, ?, 124, 215
(a)
(b)
(c)
(d)
(e)
Try the pattern $n^3$ – 1. n = 1, 2, .......
Q-8) What should come in place of the question mark (?) in the following number series?
2, 4, ?, 16, 32
(a)
(b)
(c)
(d)
(e)
The terms exhibit the pattern $2^1$, $2^2$, $2^3$ and so on.
Q-9) What should come in place of the question mark (?) in the following number series?
24, 49, ?, 94, 15, 31, 59, 58
(a)
(b)
(c)
(d)
(e)
It is a combination of two series, namely
24, 49, ?, 94; and 15, 31, 59, 58
The two series correspond to
x, (2x + 1), (4x – 1), (4x – 2)
Hence the missing term is
4 x 24 – 1 = 95
Q-10) Only one number is wrong in the following number series. Find out the wrong number.
4, 6, 18, 49, 201, 1011
(a)
(b)
(c)
(d)
(e)
The series is
× 1 + 2, × 2 + 3, × 3 + 4, × 4 + 5, × 5 + 6
The wrong number is 18.
It should be 6 × 2 + 3 = 15