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# Logical Reasoning :: Number Series

Home > Logical Reasoning > Number Series > General Questions

71. Find the number that can be put in place of the question mark.
7776,625,64,9,?

Explanation:

2=2
9 = 3*3
64 = 4*4*4
625= 5*5*5*5
7776=6*6*6*6*6

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Tags:  IBM

72.

Find the number that can be put in place of the question mark.

8,5,9,7,2,25,5,1,16,8,6,?

Explanation:

8-5=3 ->3^2=9

7-2=5 ->5^2=25

5-1=4 ->4^2=16

8-6=2 ->2^2=4

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Tags:  IBM

73. Find the number that can be put in place of the question mark.
13,21,32,49,78,131,?

Explanation:

21-13=8
32-21=11
49-32=17
78-49=29
131-78=53
232-131=101
so 11-8=3
17-11=6
29-17=12
53-29=24
101-53=48
hence 131+48=179

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Tags:  IBM

74. Find the number that can be put in place of the question mark.
0,1,2,0.5,2,2,2,2,4,3,2

Explanation:

0+1=1 & 1/2=0.5
2+2=4 & 4/2=2
So
4+3=7 & 7/2=3.5

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Tags:  IBM

75. Find the number that can be put in place of the question mark.
1.8,3,0.6,2.5,5,0.5,3.4,2,1.7,4.8,6

Explanation:

1.8/3=0.6
2.5/5 = 0.5
3.4/2=1.7
4.8/6=0.8

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Tags:  IBM

76. Find the next term of the following series.
3/2,9/4,9/4,7/2,49/4,49/4,?

Explanation:

Here is no explanation for this answer

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Tags:  IBM

77. Find the next term of the following series.
8,5,9,7,2,25,5,1,16,8,6,?

Explanation:

(8-5)^2=9
(7-2)^2=25
(5-1)^2=16
(8-6)^2=4

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Tags:  IBM

78. Find the next term of the following series.
0,1,1,2,0,5,2,2,4,2,2,4,3,7,2,?

Explanation:

(0,1,1,2,0.5),(2,2,4,2,2),(4,3,7,2,?)
0+1 = 1 , 1/2 =.5
2+2 = 4 , 4/2 = 2
4+3 = 7, 7/2 = 3.5

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Tags:  IBM

79. Find the next term of the following series.
8,0.5,16,4,15,0.3,50,4.5,6,0.2,30,?

Explanation:

8/0.5=16 and 8*0.5=4
15/0.3=50 and 15*0.3=4.5
6/0.2=30 and 6*0.2=1.2

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Tags:  IBM

80. Find the next term of the following series.
3/2, 2 1/4, 9/4, 7/2, 12 1/4, 49/4, 4/3, 1 1/7, 16/9, ?

Explanation:

(3/2)^2=9/4
(7/2)^2=49/4
(4/3)^2=16/9
(8/7)^2=64/49

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Tags:  IBM