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

Options

A. `(125)/(216)`
B. `(25)/(36)`
C. `(5)/(36)`
D. `(25)/(216)`

Answer

B

Explanation

`P(Xge3)=(5)/(6)*(5)/(6)*1=(25)/(36)`