Mathematics, 29.02.2020 01:13, julianrod1201

Before you combine similar terms(Hint: Reduce this problem to only 2 variables, say x and y. Then go back to binomial coefficients and see the different ways we arrived at them. Can you generalize now to 3?

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Before you combine similar terms(Hint: Reduce this problem to only 2 variables, say x and y. Then go...