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A man has 3 friends. The number of ways he can invite one friend everyday for dinner on 6 successive nights so that no friend is invited more than 3 times is N, then N/170 |
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Answer» A man has 3 friends. The number of ways he can invite one friend everyday for dinner on 6 successive nights so that no friend is invited more than 3 times is N, then N/170 |
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