Asked by Hannah
There are 9 girls and 11 boys on maths team 2 members get chosen for represent the school what is the probability that the 2 will be of the same sex please show me the working out too thank you
Answers
Answered by
scott
there are 20C2 ways to pick two members
there are 9C2 ways to pick two girls , and there are 11C2 ways to pick two boys
the probability of same sex is ...(9C2 + 11C2) / 20C2
there are 9C2 ways to pick two girls , and there are 11C2 ways to pick two boys
the probability of same sex is ...(9C2 + 11C2) / 20C2
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