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

Answers

drwls

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
17 years ago

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