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Hoochie [10]
3 years ago
5

A small school bus contains eight first-graders and ten second-graders. if two children are ill, what is the probability that at

least one of them is a second-grader?
Mathematics
1 answer:
xenn [34]3 years ago
3 0
At least means :
1) one of them OR
2) two of them

\binom{10}{1} \times \binom{8}{1} \: \: here \: we \: say \:
we choose one of them from second graders and another one from first garders

that "or" which I mentioned means we have to use + (plus) to go to 2nd state that I've written

in 2nd we consider that
two of them are second graders in that case:
\binom{10}{2} \times \binom{8}{0} \:
so at last we've got this
\binom{10}{1} \times \binom{8}{1} + \binom{10}{2} \times \binom{8}{0} =

you have to know the formula that I'm using
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