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प्रश्न
Think about it.
How many triangular numbers do you think there are?
लघु उत्तरीय
उत्तर
There are infinitely many triangular numbers because the formula for the n-th triangular number is `T_n = (n(n+1))/2`, and n can grow indefinitely. For every positive integer n, a unique triangular number exists.
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