What will come in place of the question mark (?) in the following number series ?

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What will come in place of the question mark (?) in the following number series ?

Asked on 2018-07-01 17:38:39 by Guest | Votes 0 | Views: 31 | Tags: ibps | ibps po | ibps po 2016 | quantitative aptitude | Add Bounty

What will come in place of the question mark (?) in the following number series ?

15, 21, 38, 65, 101, ?
1). 124
2). 145
3). 136
4). 158

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2 answers

2 vote

Answered by Guest on 2019-04-10 14:29:49 | Votes 2 | #

Solution

21 - 15 = 6

38 - 21 = 17

65 - 38 = 27

101 - 65 = 36

Now, let us take a look at the second order difference.

17 - 6 = 11

27 - 17 = 10

36 - 27 = 9

Continuing the sequence, we get the next term as 36+8 = 44

101 + 44 = 145.

Option B is the right answer.

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3 vote

Answered by Guest on 2019-05-10 21:33:11 | Votes 3 | #

Solution

21 - 15 = 6

38 - 21 = 17

65 - 38 = 27

101 - 65 = 36

Now, let us take a look at the second order difference.

17 - 6 = 11

27 - 17 = 10

36 - 27 = 9

Continuing the sequence, we get the next term as 36+8 = 44

101 + 44 = 145.

Option B is the right answer.

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