Question 416946
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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 =.3 and q = .7
nCx = {{{n!/(x!(n-x)!)}}}
P(that the pet store gets exactly one blue parakeet) = 1-P(none) = 1 - (.7)^3