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Earn +20 ptsQ: What triangular number has 4 factors?
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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.
What is the 4 triangular number?
It is 1+2+3+4 = 10.
What numbers are a square triangular and prime?
A square number is any number multiplied by itself. 3 x 3 = 9 9 is a square number. A triangular number, like a set of bowling pins, follows the pattern 1 + 2 + 3 + 4 + 5 and so on. 1, 3, 6, 10, 15 are the first five triangular numbers. A prime number is a positive integer with two factors: one and the number itself.
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