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Mohan has 8 friends, in how many ways he...

Mohan has 8 friends, in how many ways he invite one or more of them to dinner?

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Mohan select one orr more than one of his 8 friends. So,
`=.^(8)C_(1)+.^(8)C_(2)+.^(8)C_(3)+ . . .+.^(8)C_(8)`
`=2^(8)-1=255`.
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ARIHANT MATHS-PERMUTATIONS AND COMBINATIONS -Exercise (Questions Asked In Previous 13 Years Exam)
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