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The number of ways in which a host lady ...

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 attend the party together is a. `2xx\ ^(11)C_7+\ ^(10)C_8` b. `\ ^(10)C_8+\ ^(11)C_7` c. `\ ^(12)C_8-\ ^(10)C_6` d. none of these

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