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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 `X=3` equals

A

`25//216`

B

`25//36`

C

`5//36`

D

`125//216`

Text Solution

Verified by Experts

The correct Answer is:
A
`P(X=3)=((5)/(6))((5)/(6))1/6=25/216`
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