algebra
posted by mychelle on .
The formula t(n+1)over 2 will determine a triangular number, where n is a natural number. For what value of n will the triangular number 325 be found?

The correct formula is n(n+1)/2, NOT t(n+1)/2
If that number is 325,
n(n+1) = 650, and so
n = 25