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Earn +20 ptsQ: Why is 10 called a triangular number?
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Is 32 a triangular number?
32 is not a triangular number. The first few triangular numbers are 1, 3, 6, 10, 15, 21, 28, 36, 45, ...
What is the tenth triangular number?
The tenth triangular number is equal to (10 x 11) / 2 = 55.
How can sixth triangular number be 21?
Because it is ! The first 10 triangular numbers are... 1,3,6,10,15,21,28,36,45 & 55
Is 4 a triangular number?
no No it is not. The first 5 triangular numbers are: 1, 3, 6, 10, 15
What is the 4 triangular number?
It is 1+2+3+4 = 10.
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