Answers

2014-08-10T21:38:03+05:30
A number that can make a triangular dot pattern is aid to be a triangular number

Example: 1, 3, 6, 10 and 15 are triangular numbers
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2014-08-10T21:39:50+05:30
any of the series of numbers (1, 3, 6, 10, 15, etc.) obtained by continued summation of the natural numbers 1, 2, 3 etc.
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