What is the 200th triangular number?

Triangular number, I cant figure it out. Because I really need to find out for my answer

Answer #1

It is 1+2+3+4+5+ … +198+199+200 if you pair up numbers at either end of the line … 1 and 200, 2 and 199, 3 and 198, etc you will get 100 pairs, and each pair will add to 201 … So your answer will be 100 x 201 = 20,100

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