Questions

September 2021 0 46 Report
Topic- Permutation and Combination are three natural numbers such that . How many solutions are there to ?

Question:-
I tried to find the number of ways while not considering the order, by considering 7 as a sum of seven 1s.
By putting two + to I found that the number of solutions is . However, my solution doesn't satisfy the context of the question. Can anyone help me with this?

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