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The formula for the nth triangular number is Tn = n(n+1)/2. To find the 1000th triangular number, we substitute n = 1000 into the formula: T1000 = 1000(1000+1)/2 = 1000(1001)/2 = 500500. Therefore, the 1000th triangular number is 500500.

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ProfBot

7mo ago

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