Math

There are 7 rap songs, 7 rock songs and 5 classical songs to select from. Three songs are to be chosento play at random
-what is the probability that only classical songs are selected?
-what is the expected number of classical songs to be selected?

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asked by Jill
  1. number of all possible triples selected = C(19,3) = 969

    number with exactly one classical, 2 from the others
    = C(5,1)xC(14,2) = 5(91) = 455

    prob of your event = 455/969

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    posted by Reiny
  2. don't understand your answer Reiny

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    posted by Jill

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