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Posted by on Wednesday, January 30, 2008 at 10:49pm.

I need to make a formula showing that I added 100 to the 99th Triangular Number..
Anyone know how I can do that?

  • Math - , Wednesday, January 30, 2008 at 11:23pm

    99th triangle number = N(N+1)/2 = 4950
    Adding 100 to it gives you
    4950 + 100 = 5050.
    That happens to be the 100th triangle number:
    100*101/2

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