Question

Se d=n(n-3)/2 calcule o valor de d para n= 15 . B=-9 . C-8

Answer 1

d=  n(n-3)
----------------
       2

d= 15(15-3)
------------------
        2

d= 15 * 12
-----------------
        2

d=  180
---------------
        2

d=  90