Question: Start with the formula in the binomial theorem. Plug in y = 1 and Differentiate. Multiply the result by x and Dfferentiate again. Finally, plug
Start with the formula in the binomial theorem. Plug in y = 1 and Differentiate. Multiply the result by x and Dfferentiate again. Finally, plug in x = 1. What identity have you proven? Pick either side of what you have proven and give a combinatorial situation it counts
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