Posted by **Amanda** on Friday, May 25, 2007 at 9:37am.

smallest of two triangular numbers whose sum and difference are also triangular numbers

My guess would be 15.

21 - 15 = 6 and 15 + 21 = 36.

## Answer this Question

## Related Questions

- math - The smaller of two triangular numbers whose sum and difference are also ...
- Math - Mark read that the ancient Greeks use to arrange pebbles to represent ...
- Math - A triangular number is a number that can be represented by dots arranged ...
- Reiny (this was the one you helped me with) - I tried to explain it by using the...
- Reiny! Reiny! Reiny! Answer Check and HW Help! - Translate to a system of ...
- math - The triangular numbers are the numbers 1, 3, 6, 10, 15, . . .; the square...
- MATH - The triangular numbers are the numbers 1, 3, 6, 10, 15, . . .; the square...
- PreCalc - Find the maximum product of two numbers whose sum euqals 124. Let's ...
- math - This is the sequence 1,3,6,10,15 the pattern is addin 1 more than last ...
- Integers - Suppose a1, a2, . . . , an is a list of n numbers with the following ...

More Related Questions