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Earn +20 ptsQ: What is the 4 triangular number?
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What is the xth triangular number?
The formula for the nth triangular number is n(n+1)/2. Therefore, the fourth triangular number is equal to 4 x (4+1) / 2 = (4 x 5) / 2 = 10. The fiftieth triangular number is equal to 50 x (50+1) / 2 = (50 x 51) / 2 = 1275.
Is 4 a triangular number?
no No it is not. The first 5 triangular numbers are: 1, 3, 6, 10, 15
Is 9 a triangular number?
yes it is!EDIT: No, it is not.
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
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