Prove that: "The summation" from k=2 to n of (k choose 2) = (n+1 choose 3). Let n be a natural number. Please Help. thanks!
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Hello, jzellt! It helps if we know a few summation formulas: . . Prove that: . . . . . . . This is the sum of the first triangular numbers. We have: . Factor: . And we have: .
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