Question 419238
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Hi
A quiz has five multiple-choice questions, each with 4 possible answers.  
P(guessing answer correctly) = .25
P(guessing incorrectly) = .75
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=.25and q =.75
nCx = {{{n!/(x!(n-x)!)}}}
P(atleast one correct of the 5 questions) = 1 - P(none correct) = 1 - (.75)^5