A) \[\frac{14}{95}\]
B) \[\frac{7}{95}\]
C) \[\frac{1}{95}\]
D) None of these
Correct Answer: A
Solution :
There are 8 prime numbers \[2,\,\,3,\,\,5,\,\,7,\,\,11,\,\,13,\,\,17,\,\,19.\] Hence required probability \[=\frac{{}^{8}{{C}_{2}}}{{}^{20}{{C}_{2}}}=\frac{8.7}{20\,.\,19}=\frac{14}{95}\].
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