5 prefects are to be chosen from 6 boys and 4 girls.in how many ways can this be done if

a)all the prefects are boys

b)there are at least two girls

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- Jun 3rd 2010, 03:29 PMcantcountpermutation and combination question...please help!
5 prefects are to be chosen from 6 boys and 4 girls.in how many ways can this be done if

a)all the prefects are boys

b)there are at least two girls - Jun 3rd 2010, 04:10 PMgalactus