show that 210 is a triangular number

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Show that 210 is a triangular number. Would it suffice to solve the equation 210=((n)(n+1))/2 ? Then n is equal to 20 and -21but n in this case must be positive, so 210 would be the 20th triangular number.

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1 Answer

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Yes, indeed, your solution suffices. Well done!

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