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Earn +20 ptsQ: List of triangular numbers
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Smaller of two triangular numbers whose sum and difference are also triangular numbers?
The answer would be 15 and 21. The triangular numbers are 1,3,6,10,15,21,28,36,45,55,66,78. 15 plus 21 is 36 which is on the list. 21 minus 15 is 6 and that is on the list as well.
List all the triangular numbers up to 36?
1, 3, 6, 10, 15, 21, 28, 36
What are the first 5 triangular numbers?
Triangle numbers or triangular numbers are those numbers that can form an equilateral triangle when counting the objects. The first five triangular numbers are: 1, 3, 6, 10, 15.
What two triangular numbers make sixteen?
6 and 10 are triangular numbers that make 16.
The smaller of two triangular numbers whose sum and difference are also triangular numbers?
the answer is of course 12
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