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What will come in place of question mark '?' in the given number series?  3, 4, 5, ?, 13, 84, 85

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What will come in place of question mark '?' in the given number series? 

3, 4, 5, ?, 13, 84, 85


1). 7
2). 5
3). 9
4). 12


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Given series are Pythagorean triplets such that, the third term of one triplet is the first term of another triplet

⇒ 5, a and 13 are Pythagorean triplet

⇒ 52 + a2 = 132

⇒ 25 + a2 = 169

∴ a = 12

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