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"21" but to be extra smart the answer is "The seventh triangular number is twenty one."

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Q: If the eighth triangular number is 36 what is the seventh trianguler number?
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Is 12 a trianguler number?

Triangular number: An integer of the form (1/2)n(n + 1), where n is a positive integer.12 is not a triangular number. The first few triangular numbers are 1, 3, 6, 10, and 15.


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