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Earn +20 ptsQ: Is 19 a triangular number
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Is 190 a triangular number?
The explicit formula of a triangular number is:(n + 1 choose 2) which is equivalent to (n + 1)!/(2!(n + 1 - 2)!) = (n + 1)!/(2!(n - 1)!)Assume that 190 is a triangular number. Then:190 = (n + 1)!/(2!(n - 1)!)190 = n(n + 1)/2380 = n(n + 1)380 = n² + n0 = n² + n - 3800 = (n + 20)(n - 19)So n = -20 and n = 19But n has to be positive since n determines the nth triangular number. Therefore, n = 19.Therefore, 19 is a triangular number.
Is 63 a Triangular Number?
Is 63 a triangular number I think it is a triangular number.
What is a number that is a triangular number and a triangular number?
013
Is 23 a triangular number?
yes it is a triangular number
Is 18 a triangular number?
No, 18 is not a triangular number.
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