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Find the next number in the series 3, 4, 5, 5, 12, 13, 7, 24, 25, 8, 15, ...

26
16
17
18

Correct Answer: 17

Explanation:

The pattern is $32 + 42 = 52$ , $52 + 122 = 132$ , $72 + 242 = 252$

The next number = $82 + 152 = 172$

i.e. 17

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