[RPET 1995]
A) $ \frac{3}{8} $
B) $ \frac{5}{8} $
C) $ \frac{6}{8} $
D) $ \frac{10}{20} $
Correct Answer: B
Required probability $ =\frac{{}^{5}C_1}{{}^{8}C_1}=\frac{5}{8}. $
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