Let `S` be a set of first fourteen natural nurnbers. The possible number of pairs `(a, b)`, where `a, b,in S` and `a n

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Q 1648891703.     Let `S` be a set of first fourteen natural nurnbers.
The possible number of pairs `(a, b)`, where `a, b,in S`
and `a ne b` such that `ab` leaves remainder `1` when
divided by `15`, is
CDS 2016
A

`3`

B

`5`

C

`6`

D

`text(None of these)`

HINT


Solution
(Provided By a Student and Checked/Corrected by EXXAMM.com Team)

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