Asked by Sara
A box contains 10 red balls and 10 green balls. Five draws are made without replacement.
Find the probability of selecting 4 balls of the same colour.
Find the probability of selecting 4 balls of the same colour.
Answers
Answered by
Reiny
could be 4 green and one red , or, 4 red and 1 green
prob(the stated event) = ( C(10,4)*C(10,1) + C(10,4)*C(10,1) )/C(20,5)
= .....
prob(the stated event) = ( C(10,4)*C(10,1) + C(10,4)*C(10,1) )/C(20,5)
= .....
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