Posted by **Bob** on Wednesday, January 30, 2008 at 12:25am.

I need help with making a formula..?

This is what I put..

"The 100th Triangular Number is 5,050. I found this by adding 100 to the value of the 99th Triangular Number. The 99th Triangular Number is 4,950. The formula I used to find it is..."

Help?

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