Question 389598
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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(all 4 randomly selected owning a microwave) = (.75)^4 = .3164