A) 81
B) 5
C) 9
D) 31
Correct Answer: B
Solution :
Probability of getting 3 sixes \[{{=}^{4}}{{C}_{3}}{{(1/6)}^{3}}\times (5/6)\] \[=5/324\] \[\therefore \]Expected number of times 3 sixes occur \[=324\times \frac{5}{324}=5\]
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