A) \[\frac{^{7}{{C}_{2}}\times {{5}^{5}}}{{{6}^{7}}}\]
B) \[\frac{^{7}{{C}_{2}}\times {{5}^{5}}}{{{6}^{8}}}\]
C) \[\frac{^{7}{{C}_{2}}\times {{5}^{5}}}{{{6}^{6}}}\]
D) None of these
Correct Answer: B
Solution :
Probability of getting success, \[p=\frac{1}{2}\] an probability of failure, \[q=1-\frac{1}{2}=\frac{1}{2}\] Required probability \[{{=}^{7}}{{C}_{2}}{{\left( \frac{1}{6} \right)}^{2}}{{\left( \frac{5}{6} \right)}^{5}}\times \frac{1}{6}=\frac{^{7}{{C}_{2}}\times {{5}^{5}}}{{{6}^{8}}}\]
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