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Logical Reasoning :: Number Series

Home > Logical Reasoning > Number Series > General Questions

161. What comes next in the sequence?
9,4,16,6,36,21,441,?

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Answer: Option E

Explanation:

9-5=4
4*4=16
16-10=6
6*6=36
36-15=21
21*21=441
So, 441-20=421

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Tags:  IBM

162. What comes next in the sequence?
340,680,1428,3141.6,?

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Answer: Option D

Explanation:

340*2=680
680*2.1=1428
1428*2.2=3141.6
3141.6*2.3=7225.68

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Tags:  IBM

163. What comes next in the sequence?
1.8,3,0,6,2.5,5,0.5,3.4,2,1.7,4.8,6,?

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Answer: Option B

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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164. What comes next in the sequence?
49,6,25,4,36,5,81,8,?

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Answer: Option D

Explanation:

7^2=49, 7-1=6, 6*2^2=24+1=25
5^2=25, 5-1=4, 4*3^2=36
6^2=36, 6-1=5, 5*4^2=80+1=81
9^2=81, 9-1=8, 8*5^2=200

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165. What comes next in the sequence?
11.5,17.5,35.5,89.5

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Answer: Option D

Explanation:

11.5 =11.5
11.5 +(6) = 17.5
17.5 +(6*3) = 17.5 + 18 = 35.5
35.5 +(18*3) = 35.5 + 54 = 89.5
89.5 +(54*3) = 89.5 + 162 = 251.5

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166. What comes next in the sequence?
10,12,-36,-7,-5,15,19,21,?

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Answer: Option B

Explanation:

Split the series as below
10, 12, -36 | -7, -5, 15 | 19 21 ?
10+2=12
-7+2=-5
19+2=21
12*-3=-36
-5*-3=15
21*-3=-63

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167. What comes next in the sequence?
52,62,42,78,89,68,49,61,39,63,76,?

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Answer: Option C

Explanation:

52,62,42 | 78,89,68 | 49,61,39 | 63,76,?
Reverse of first and third are consecutive
i.e (25,24),(87,86),(94,93) => (36,35)
Reverse of 35 = 53

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168. What comes next in the sequence?
4.2,26.0,8.9,8.4,52.0,17.8,16.8,104.0,?

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Answer: Option C

Explanation:

4.2,26.0,8.9 | 8.4,52.0,17.8 | 16.8,104.0,?
multiply by 2 in respective positions so 17.8*2= 35.6

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169. What comes next in the sequence?
9,3,6,21,9,12,33,15,?

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Answer: Option A

Explanation:

(3*1)+(3*2)=9
(3*3)+(3*4)=21
(3*5)+(3*6)=33
(3*7)+(3*8)=45

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170. What comes next in the sequence?
24, 42, 1/2, 2, 65, 56, 1 1/5, 5/6, 73, 37

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Answer: Option C

Explanation:

24,42,
2/4=1/2, 4/2=2 next two nos,
65, 56,
6/5=1 1/5,5/6 next two nos,
73, 37
7/3= 2 1/3, 3/7
so 2 1/3

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