Question 813316
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Hi,
Note: The probability of x successes in n trials is: 
P = nCx* {{{p^x*q^(n-x)}}} where p and q are the probabilities of success and failure respectively. 
In this case p= .75  & q = .25
nCx = {{{n!/(x!(n-x)!)}}}
P(3 out of 5) = {{{(5!/3!2!)(.75)^2(.25)^2}}} = .2637