a) 9
b) 30
c) 36
d) 15
Answer: d
Explanation: There are 6 candidates and a voter has to vote for any two of them. So, the required number of ways is,
$$\eqalign{
& { = ^6}{{\text{C}}_2} \cr
& = \frac{{6!}}{{2! \times 4!}} \cr
& = 15 \cr} $$
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