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- November 22nd 2007, 05:11 AMjames_bondExplicit form
- November 22nd 2007, 05:54 AMmath sucks

Inside the parenthesis is the sum of the first triangular numbers. This can be given by the formula,

Then,

- November 22nd 2007, 05:59 AMSoroban
Hello, James!

Quote:

Find the explicit form for: .

We have: .

. .

. .

Factor: .

Therefore: .