A) \[\frac{27}{20}\,{{\left( \frac{19}{20} \right)}^{7}}\]
B) \[\frac{533}{400}\,{{\left( \frac{19}{20} \right)}^{6}}\]
C) \[\frac{153}{20}\,{{\left( \frac{1}{20} \right)}^{7}}\]
D) \[\frac{35}{16}\,{{\left( \frac{1}{20} \right)}^{6}}\]
Correct Answer: A
Solution :
Required probability \[={}^{8}{{C}_{1}}{{\left( \frac{1}{20} \right)}^{1}}{{\left( \frac{19}{20} \right)}^{7}}+{}^{8}{{C}_{0}}{{\left( \frac{1}{20} \right)}^{0}}{{\left( \frac{19}{20} \right)}^{8}}=\frac{27}{20}{{\left( \frac{19}{20} \right)}^{7}}\]
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