Bill wants to see how many times he needs to roll a standard number cube before getting a 5. What is the probability that Bill w
ill roll a 5 on his third roll and not before?
a. 125/1296
b. 25/216
c. 1/6
d. 1/2
2 answers:
5/6 • 5/6 • 1/6 = 25/216 the answer is b
Answer:
The answer is b. 25/216
Step-by-step explanation:
Bill wants to see how many times he needs to roll a standard number cube before getting a 5.
p =
(on an average: roll 6 times before getting a 5)
The required probability can be found as :

= 
= 
So, the answer is b. 25/216
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