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Problem 5. Triangle Numbers

Triangle numbers are the sums of successive integers. So 6 is a triangle number because

 6 = 1 + 2 + 3

which can be displayed in a triangular shape like so

      *
     * *
    * * * 

Thus 6 = triangle(3). Given n, return t, the triangular number for n.

Example:

 Input  n = 4
 Output t is 10

Solution Stats

62.7% Correct | 37.3% Incorrect
Last Solution submitted on Dec 13, 2019

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