Q. 18
Mark the correct alternative in the following:
The number of ways in which a host lady can invite for a party of 8 out of 12 people of whom two do not want to attend the party together is
A. 
B. 
C. 
D. none of these
Answer :
A host lady can invite 8 out of 12 people in 12C8 ways.
Two out of these 12 people do not want to attend the party together.
Number of ways =
12C8 - 10C6
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