Asked by Anonymous
A bag contains 3 black balls,4yellow balls . find probability that both are of the same colour if 2balls are picked at random with out replacement.
Answers
Answered by
mathhelper
They must either be both black or both yellow
prob(of that event) = (3/7)(2/6) + (4/7)(3/6) = 3/7
or
prob = ( C(3,2) + C(4,2) )/C(7,2) = (3 + 6)/21 = 9/21 = 3/7
prob(of that event) = (3/7)(2/6) + (4/7)(3/6) = 3/7
or
prob = ( C(3,2) + C(4,2) )/C(7,2) = (3 + 6)/21 = 9/21 = 3/7
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