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Q.

Naresh has 10 friends and he wants to invite 6 of them to a party.  How many times will 3 particular friends never attend the party?

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a

8

b

7

c

35

d

40

answer is B.

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Detailed Solution

Remove the 3 particular friends and invite 6 friends from the remaining  7=(10−3) friends

This can be done in  7C6 ways

Required number of ways = 7C6

= 7C1=7.

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