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A fair dice is thrown untill a score of ...

A fair dice is thrown untill a score of less than 5 points is obtained. Find the probability of obtaining not less than 2 points on the last thrown

A

`3/4`

B

`4/5`

C

`5/6`

D

`1/2`

Text Solution

Verified by Experts

The correct Answer is:
D
A= number less than five = {1,2,3,4} and B = number less than three ={1,2}
A `nn`B={1,2},n(A)=4,n(B)=2 and n(A `nn`B)=2
Hence, `P(B/A)=(P(A nnB))/(P(A))=(n(A nnB))/(n(A))=2/4=1/2`
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