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What is the xth triangular number?

Updated: 12/16/2022

Wiki User

∙ 8y ago

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The formula for the nth triangular number is n(n+1)/2. Therefore, the fourth triangular number is equal to 4 x (4+1) / 2 = (4 x 5) / 2 = 10. The fiftieth triangular number is equal to 50 x (50+1) / 2 = (50 x 51) / 2 = 1275.

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∙ 15y ago

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Wiki User

∙ 8y ago

The nth triangular number is n(n+1)/2

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