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Question Number 139697 by otchereabdullai@gmail.com last updated on 30/Apr/21
In an entrance examination each   question has four possible answers.  A candidate answers three question  by guessing .  a. find the probability that all three   questions are wrong.  b. find the probability that all the   questions are correct.
Inanentranceexaminationeachquestionhasfourpossibleanswers.Acandidateanswersthreequestionbyguessing.a.findtheprobabilitythatallthreequestionsarewrong.b.findtheprobabilitythatallthequestionsarecorrect.
Answered by mr W last updated on 30/Apr/21
a.  p=((3×3×3)/(4×4×4))=((27)/(64))  b.  p=((1×1×1)/(4×4×4))=(1/(64))
a.p=3×3×34×4×4=2764b.p=1×1×14×4×4=164
Commented by otchereabdullai@gmail.com last updated on 30/Apr/21
Prof W you are supper!
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