a) 15
b) 45
c) 60
d) 9
Answer: c
Explanation: Required number of ways
$$\eqalign{
& = \left( {{}^3{C_2} \times {}^6{C_3}} \right) \cr
& = \left( {{}^3{C_1} \times {}^6{C_3}} \right) \cr
& = \left( {3 \times \frac{{6 \times 5 \times 4}}{{3 \times 2 \times 1}}} \right) \cr
& = 60 \cr} $$
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