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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 12,22,32,42,.... etc., the numbers of the two series are placed alternatively.

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