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A fair die is tossed repeatedly until a ...

A fair die is tossed repeatedly until a 6 is obtained. Let X denote the number of tosses required.
The probability that `Xgt=3` equals

A

`125//216`

B

`25//36`

C

`5//36`

D

`25//216`

Text Solution

Verified by Experts

The correct Answer is:
B
Given that `P(Xle2)=1/6+5/6xx1/6=11/36`
Hence, the required probability is `1-(11//36)=25//36.`
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