A) \[\frac{13}{36}\]
B) \[\frac{15}{72}\]
C) \[\frac{19}{72}\]
D) \[\frac{19}{36}\]
Correct Answer: C
Solution :
P (7 or 8) |
a. \[=P(H)P(7\,or\,8)+P(T)P(7\,or\,8)\] |
b. \[=\frac{1}{2}\times \frac{11}{36}+\frac{1}{2}\times \frac{2}{9}=\frac{11}{72}+\frac{1}{9}=\frac{19}{72}.\] |
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