A) \[\frac{21}{316}\]
B) \[\frac{19}{316}\]
C) \[\frac{1}{4}\]
D) None of these
Correct Answer: B
Solution :
Total number of ways \[={{\,}^{80}}{{C}_{2}}\] and favorable ways \[{{=}^{20}}{{C}_{2}}\] \ Required probability \[P=\frac{^{20}{{C}_{_{2}}}}{^{80}{{C}_{2}}}=\frac{19}{316}\].
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