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A package of 15 apples contains two defective apples. Four apples are selected at random, (a) Find the probability that none of the selected apples is defective. (b) Find the probability that at least one of the selected apples is defective.

Answer :

RIVRMYDALEGO

Combination of n things taken r at a time: nCr

a) combinations of healthy apples/all combinations

=13C4/15C4

=715/1365

 

=.5238

.

b) 1-.5238=.4762

.

Ed

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