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Sigma n3

Which number ...

Question

Which number should replace the question mark ?
1, 1, 4, 2, 9, 3, 16, 4, ?

A

18

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B

15

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C

25

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D

32

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Solution

The correct option is D 25
It's the combination of two series,
1, 2, 3, 4, 5, ..... and $1^{2}, 2^{2}, 3^{2}, 4^{2}, . . . .$ etc., the numbers of the two series are placed alternatively.

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