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  • In a group of 6 boys and 4 girls, four children are to be selected. In how many different ways can they be selected such that at least one boy should be there?

In a group of 6 boys and 4 girls, four children are to be selected. In how many different ways can they be selected such that at least one boy should be there?

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eginarrayl extGiven,\ extTotal number of student, 6 extboys & 4 extgirls\ extNumber of way takeing 4 student from 10 studnets,=^10C_4=210\ extNow we take 4 studnets, where no boys so, it means we take only girls.=^4C_4=1\ extNow we take 4 studnets, where atleast 1 boys so, it means other then only girl group=210-1=209\ endarray

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Deependra Verma

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