Maths Puzzle Algebra

If 2=1, 3=3, 4=6 and 5=10 what is the formula?

Read Solution (Total 1)

n(n-1)/2

2(2-1)/2=1
3(3-1)/2=3
4(4-1)/2=6
5(5-1)/2=10 and so on..
10 years agoHelpfull: Yes(0) No(0)

Other Question

Use T: (x,y)-> (x - 1, y +2), P(2,3), origin O, and line l with equation y =x.
Draw the graph and complete each statement.

14. Rx o Ry: (2,3) -> (___, ____)
15. T o Rx: (4 Let f(x)= -2x, g(x)= x(to the second power) + 2, h(x)= 4x + 3
1. (f+g)(x)
2. (g-h)(x)