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There are 15 boys and 10 girls in your class. A four member committee is to be formed from the students of your class. In how many ways this can be done if

the committee consists at least three girls


The number of ways 3 girls can be chosen=10*9*8=720
the number of ways 1 boy could be chosen=15
number of ways a committee could be formed=720*15=10800
0 0 0
Why multiplied by 9 and then followed by 8 ?
because. it is like make 3 boxes each representing one girl. you can place a total of 10 girls in that box. then as one of the girl is placed in the first block, 9 are left which can be placed in the second block and again 8 in the third block.
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