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Earn +20 ptsQ: What two triangular numbers make sixteen?
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The smaller of two triangular numbers whose sum and difference are also triangular numbers?
the answer is of course 12
What two numbers are triangular and square?
34
How many triangular numbers are also square numbers?
There are an many triangular numbers that are also square numbers. Simply put, the sum of two consecutive triangular number equals a square number. Examples include 1 and 36.
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.
What re the two triangular numbers between 50 and 70?
55 & 66
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