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Earn +20 ptsQ: Why is 20 not a triangular number?
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Is 20 a triangular number?
No.
How do you find the 20Th triangular number?
The 20th triangular number is 20*21/2 = 210
Which number between 20 and 40 is both a triangular number and a square number 36 or 25 or 21 or 35?
36 is the only square number that is also a triangular number between 20 and 40.
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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