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Question

A person wants to invite one or more of his friend for a dinner party. In how many ways can he do so if he has eight friends :-

A
28
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B
281
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C
82
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D
8C1+8C2+.....+8C8
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Solution

The correct options are
A 281
D 8C1+8C2+.....+8C8
Selection of atleast 8 people will be
=8C1+8C2+...8C8
=8r=18Cr
=(1+x)88C0 at x=1
=281.

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