I want to solve this problem using Induction $\displaystyle \sum _{i=0}^{x - n} {(x - (i + 1)) \choose n } = {x \choose n + 1}$ How can I prove it .......................
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Originally Posted by muhammad I want to solve this problem using Induction $\displaystyle \sum _{i=0}^{x - n} {(x - (i + 1)) \choose n } = {x \choose n + 1}$ How can I prove it ....................... For starters, what is your base step?
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