Question: just combinatorial proof no binomial theorem or mathematical induction 2. Give a combinatorial proof (not an algebraic proof!) of the fact that if n is

just combinatorial proof no binomial theorem or mathematical induction 2. Give

just combinatorial proof no binomial theorem or mathematical induction

a combinatorial proof (not an algebraic proof!) of the fact that if

2. Give a combinatorial proof (not an algebraic proof!) of the fact that if n is a positive integer, then = n20-1

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