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7 relatives of a man comprises 4 ladies ...

7 relatives of a man comprises 4 ladies and 3 gentlemen, his wife also has 7 relatives , 3 of them are ladies and 4 gentlemen. In how many ways can they invite a dinner party of 3 ladies and 3 gentlemen , so that there are 3 of man's relative and 3 of the wife ,s relatives ?

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The correct Answer is:
485 ways
The points A, B, C are collinear.
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