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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 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

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.