A) 0.24
B) 0.244
C) 0.024
D) None of these
Correct Answer: B
Solution :
Required probability = probability that either the number is 7 or the number is 8. i.e., Required Probability \[={{P}_{7}}+{{P}_{8}}\] Now \[{{P}_{7}}=\frac{1}{2}.\frac{1}{11}+\frac{1}{2}.\frac{6}{36}=\frac{1}{2}\left( \frac{1}{11}+\frac{1}{6} \right)\] \[{{P}_{8}}=\frac{1}{2}.\frac{1}{11}+\frac{1}{2}.\frac{5}{36}=\frac{1}{2}\left( \frac{1}{11}+\frac{5}{36} \right)\] \[\therefore \,\,\,P=\frac{1}{2}\left( \frac{2}{11}+\frac{11}{36} \right)=0.244.\]
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