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Let,x= Number of fimes the person wins a prize out of 4 gleses.x \rightarrow Binomial (n=4, p=0.2)we have to find probability that the person wins a prize exactly 2 times\begin{array}{l}\text { i.e. } p(x=2) \\p(x=2)=\left(\begin{array}{l}4 \\2\end{array}\right)(0.2)^{2}(0.8)^{2}\end{array} ...