Logical Reasoning :: Number Series

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Look at this series: 36, 34, 30, 28, 24, ... What number should come next?


A20

B22

C23

D26

Answer: Option B

Explanation:

the first diffrence is of 2



and the second diffrence is of 4



and the sequence continues so 24-2=22

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Look at this series: 80, 10, 70, 15, 60, ... What number should come next?


A20

B25

C30

D50

Answer: Option A

Explanation:

here 1,3,5............... terms are decreasing by 10



and 2,4,6,8................ are being increased by 5



so 6th term = 15 5=20;

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Find the number that can be put in place of the question mark. 3 12 7 26 15 b?


A64

B55

C45

D54

Answer: Option D

Explanation:

(Logic: 3*2+1=7 12*2+2=26
7*2+1=15 26*2+2=54)

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find the number that can be put in place of the question mark
5,6,?,87,412,2185.


A13

B14

C18

D20

Answer: Option D

Explanation:

series in the form of 5*1+1^3=6,6*2+2^3=20,20*3+3^3=87,87*4+4^3=412,412*5+5^3=125.

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find the number that can be put in place of the question mark.
1.25,3,7.1,1.50,1,8.1,1.75,-1,?


A8.1

B9.1

C9

D4

Answer: Option B

Explanation:

1.25+0.25=1.50+0.25=1.75
3-2=1-2=-1
7.1+1=8.1+1=answer is 9.1

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Find the number that can be put in place of the question mark.
3 7 14 23 36 49 ? 83 104


A66

B56

C110

D62

Answer: Option B

Explanation:

7-3=4 4*4=16 16-2=14
36-23=13 13*4=52 52-3=49
83-56=27 27*4=108 108-4=104

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Find the missing in the series: 70, 54, 45, 41,__.


A40

B37

C39

D33

Answer: Option A

Explanation:

70-54 = 16 = 4^2
54-45 = 9 = 3^2
45-41 = 4 = 2^2
41-40 = 1 = 1^2.

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Find the missing term of the series:-
2,5,10,17,?,41


A38

B41

C28

DNone of these

Answer: Option C

Explanation:

2+3=5, 5+5=10, 10+7=17,
So, the next prime number is 11
so,17+11=28.
and, 28+13=41

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Find the next term of the series:-
7,14,55,110,?


A121

B115

C125

D120

Answer: Option A

Explanation:

7 + 7 = 14, and reverse of 14 is 41
Now, 41+14=55
Similarly,
Reverse of 55 is 55.
Thus, 55 +55=110.
Now, reverse of 110 is 011
so the next term is 110+011=121.

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Find the wrong number in the given series.
3, 4, 10, 32, 136, 685, 4116


A10

B32

C136

D4116

Answer: Option B

Explanation:

The sequence is as follows :

2nd term = (1st term 1) * 1

3rd term = (2nd term 1) * 2

4th term = (3rd term 1) * 3 and so on.

So, 32 is wrong and must be replaced by (10 1) * 3  i.e. 33.

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