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The sequence of triangular numbers, starting at the 0th triangular number, is, 0, 1, 3, 6, 10, 15, 21, 28, 36, 45, 55, 66, 78, 91, 105, 120, 136, 153, 171, 190, 210, 231, 253, 276, 300, 325, 351, 378, 406, 435, 465, 496, 528, 561, 595, 630, 666...

Therefore, the 15th triangular number is 120.

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Kend Proj

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3y ago
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syed abdi

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3y ago
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syed abdi

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3y ago
is it good???

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Q: What is the 15th triangular number?
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