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combinatorics course but this is the calculus aspect ...need help with a step by step explanation (a) Prove by Induction on n, 3 + -

combinatorics course but this is the calculus aspect ...need help with a step by step explanation

(a) Prove by Induction on n, 3 + - + ... + 1 for n > k. (b) Hence prove by Induction on n, that the number of r-combinations atr-1 taken from n objects with repetitions allowed is [7] n - 1

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