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In a cricket match, a batsman hits the boundary $7$ times out of the $42$ balls he plays. The probability of his not hitting a boundary is :
- (a)$\frac{1}{7}$
- (b)$\frac{2}{7}$
- (c)$\frac{5}{6}$
- (d)$\frac{1}{6}$
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(C) $\frac{5}{6}$