a) 45
b) 50
c) 55
d) 60
Answer: d
Explanation:
$$\eqalign{
& {\text{(C}}{\text{.P}}{\text{.}}\,{\text{of}}\,{\text{17}}\,{\text{balls) – (S}}{\text{.P}}{\text{.}}\,{\text{of}}\,{\text{17}}\,{\text{balls) = (C}}{\text{.P}}{\text{.}}\,{\text{of}}\,{\text{5}}\,{\text{balls)}} \cr
& \Rightarrow {\text{C}}{\text{.P}}{\text{.}}\,{\text{of}}\,{\text{12}}\,{\text{balls = S}}{\text{.P}}{\text{.}}\,{\text{of}}\,{\text{17}}\,{\text{balls = Rs}}{\text{.720}} \cr
& \Rightarrow {\text{C}}{\text{.P}}{\text{.}}\,{\text{of}}\,{\text{1}}\,{\text{ball}} = Rs.\,\left( {\frac{{720}}{{12}}} \right) = Rs.\,60 \cr} $$
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