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What should come in place of question mark ‘?’ in the following series? -1, 2, 15, 44, ?

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What should come in place of question mark ‘?’ in the following series?

-1, 2, 15, 44, ?


1). 65
2). 85
3). 75
4). 55


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Answered by on | Votes 0 |

The pattern of the given series is:

⇒ 13 - 12 - 1 = -1

⇒ 23 - 22 - 2 = 2

⇒ 33 - 32 - 3 = 15

⇒ 43 - 42 - 4 = 44

⇒ 53 - 52 - 5 = 95 = ?

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