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The triangular numbers under 100 are:

0, 1, 3, 6, 10, 15, 21, 28, 36, 45, 55, 66, 78, 91

A triangular (or triangle) number is a number which can be made by dots in rows - the first row 1 dot, the 2nd row 2 dots (3 total in the triangle), 3rd row 3 dots (6 total) .... like Bowling pins are placed.

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