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Help needed for this simple problem, editorial not available

Revision en1, by Not_mee, 2023-08-20 19:06:57

Can anyone here explain me how to solve this Problem as there is no official editorial available . Thank You for your time in Advance

Tags combinatorics

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en1 English Not_mee 2023-08-20 19:06:57 250 Initial revision (published)