1. 36, 34, 30, 28, 24, ... What number should come next?
a) 20
b) 22
c) 23
d) 26
Explanation: This is an alternating number subtraction series. First, 2 is subtracted, then 4, then 2, and so on.
2. 22, 21, 23, 22, 24, 23, ... What number should come next?
a) 22
b) 24
c) 25
d) 26
Explanation: In this simple alternating subtraction and addition series; 1 is subtracted, then 2 is added, and so on.
3. 53, 53, 40, 40, 27, 27, ... What number should come next?
a) 12
b) 14
c) 27
d) 53
Explanation: In this series, each number is repeated, then 13 is subtracted to arrive at the next number.
4. 21, 9, 21, 11, 21, 13, 21, ... What number should come next?
a) 14
b) 15
c) 21
d) 23
Explanation: In this alternating repetition series, the random number 21 is interpolated every other number into an otherwise simple addition series that increases by 2, beginning with the number 9.
5. 58, 52, 46, 40, 34, ... What number should come next?
a) 26
b) 28
c) 30
d) 32
Explanation: This is a simple subtraction series. Each number is 6 less than the previous number.
6. In the following number series a wrong number is given. Find out the wrong number.
150, 450, 750, 1060,1350,1650,1950
a) 1060
b) 1950
c) 450
d) 1350
Explanation:
By adding 300 to each term, we get the next term. 1060 is wrong term. It should be 1050.
7. What will come at the place of question mark ?
5690, 5121, 4552, 3983, 3414, 2845, ?
a) 2276
b) 2516
c) 2356
d) 2456
Explanation:
By subtracting 569, we get the next term.
Required number,
= 2845-569
= 2276.
8. What will come at the place of question mark ?
6, 13, 28, 59, ?, 249.
a) 124
b) 122
c) 120
d) 118
Explanation:
First term → 6
Second term → (6*2+1) = 13
Third term → (13*2+2) = 28
Fourth term → (28*2+3) = 59
Fifth term → (59*2+4) = 122
Sixth term → (122*2+5) = 249
So, the required term = 122.
9. What will come at the place of question mark ?
4, 8, 10, 14, 16, 20, ?
a) 22
b) 21
c) 20
d) 16
Explanation:
Above series contains two sub-series in it.
4, 10, 16, 22
8, 14, 20
Each of both term there is difference of 6 i.e. next term is 6 greater than previous term.
10. What will come at the place of question mark ?
9, 17, 33, 65, ?
a) 117
b) 119
c) 129
d) 99
Explanation:
First term → 9
Second term → (9 *2 -1) = 17
Third term → (17 *2 -1) = 33
Fourth term → (33 *2 -1) = 65
Fifth term → (65 *2 -1) = 129