Let S be a set of first fourteen natural numbers The possible number of pairs a b where a b Icirc S ...........

Quantitative Aptitude (CDS) Number System

Let S be a set of first fourteen natural numbers. The possible number of pairs (a, b), where a, b ÎS and a ¹ b such that ab leaves remainder 1 when divided by 15, is

None of the above

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Explanation:

The possible set of pairs (a, b) such that ab leaves remainder 1 when divided by 15 are (2, 8), (8,2) (7,13) and (13, 7).
Number of possible set of pairs = 4