Question: Please help with it 4. Prove that _1-2 C(j, 2) = C(n + 1, 3), by... (a) (3 points) Mathematical induction, and by... (b) (3

Please help with it

4. Prove that _1-2 C(j, 2) = C(n + 1, 3), by... (a) (3 points) Mathematical induction, and by... (b) (3 points) A combinatorial argument. (c) (4 points) State and prove a generalization of the above identity

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