Question

$$\mathrm{A}$$ and $$\mathrm{B}$$ play a game in which $$\mathrm{A}^{'}\mathrm{s}$$ chance of winning is $$\displaystyle \frac{1}{5}$$ in a series of $$6$$ games, the probability that $$\mathrm{A}$$ will win all the $$6$$ games is

A
62C(15)6
B
66C(15)6(45)0
C
(45)6
D
65C(15)5(45)

Solution

The correct option is B $$_{ 6 }^{ 6 }{ C }\left (\displaystyle\frac { 1 }{ 5 } \right )^{ 6 }\left (\displaystyle\frac { 4 }{ 5 }\right )^{ 0 }$$As chance of winning is  $$\dfrac {1}{5}$$.For a series of $$6$$ games, the probability that $$A$$ will win all the $$6$$ games, $$n= 6$$ and $$k = 6$$ probability of win $$= p =$$ $$\dfrac {1}{5}$$ Probability for $$k$$ success is  = $$^{n}C_{k}\left ( p \right )^{k}\left ( 1-p \right )^{n-k}$$  Probability $$=$$  $$^{6}C_{6}\left ( \dfrac {1}{5} \right )^{6}\left ( 1- \dfrac {1}{5}\right )^{6-6}$$ $$=$$  $$^{6}C_{6}\left ( \dfrac {1}{5} \right )^{6}\left ( \dfrac {4}{5}\right )^{0}$$ Maths

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