Asked by Courtney

A box contains some red balls and some blue balls. There are four more blue balls than red balls. A ball is removed at random, replaced and a second ball randomly removed. The probability that the two balls are different colours is 21/50. How many balls of each colour are in the box?
Answered by Courtney
How is it 0.8? What is the working out?
Answered by .
I'm stuck on it to
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