Clever Ball Math
26 March 2009
Clever Ball Math
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GCSE maths question checking i got the answer.?
Ok, i had my gcse maths today not too bad.
one question was "*john* had 20 balls in a bag.
5 orange
7 yellow
8 red
he takes 2 balls.
what is the probability that he does not take two balls of the same colour."
i got 0.69 but i was wondering if someone clever could work it out so i can know for sure
hope someone can tell me
Aldinho
Hi,
I agree with your answer.
5/20*15/19 + 7/20*13/19 + 8/20*12/19 = .68947
I hope that helps!! 