Question

Se d=n(n-3)/2 calcule o valor de d pra n=15

Answer 1

d = 15 (15-3) / 2
d = 15 * 12/2
d = 90

Answer 2

d=n(n-3)/2 =           para n=15
d=15(15-3)/2 =
d=15(12)/2 =
d=180/2 = 
d= 90