Help needed in combinatorics:

Revision en1, by ASHWANTH_K, 2024-05-22 09:26:30

I came across an equation, but I am not able to prove it. Can somebody help me proving this equation.

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en2 English ASHWANTH_K 2024-05-22 09:28:25 80 (published)
en1 English ASHWANTH_K 2024-05-22 09:26:30 218 Initial revision (saved to drafts)