Question 393159
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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(not going on vacation)= .70 and  q = .30
nCx = {{{n!/(x!(n-x!))}}}
P(3 selected not going on vacation) = (.70)^3 = .343