The possible number of pairs (a, b), where a, b belong S :

Let S be a set of first fourteen natural numbers. The possible number of pairs (a, b), where a, b belong S and a does not equal to b such that ab leaves remainder 1 when divided by 15, is
(a) 3
(b) 5
(c) 6
(d) None of the above

Anurag Mishra Professor Asked on 19th February 2016 in Maths.
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    Answer: (d) None of the above

    Anurag Mishra Professor Answered on 19th February 2016.
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