a) 16
b) 36
c) 45
d) 60
Answer: d
Explanation: Required number of ways
$$\eqalign{
& = {{}^4{C_2} \times {}^5{C_3}} \cr
& = {{}^4{C_2} \times {}^5{C_2}} \cr
& = {\frac{{4 \times 3}}{{2 \times 1}} \times \frac{{5 \times 4}}{{2 \times 1}}} \cr
& = 60 \cr} $$
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