A fair die is tossed repeatedly until a 6 is obtained. Let X denote the number of tosses rerquired. The probability that `X=3` equals
A fair die is tossed repeatedly until a 6 is obtained. Let X denote the number of tosses rerquired.
The probability that `X=3` equals
A. `25//216`
B. `25//36`
C. `5//36`
D. `125//216`
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