Question

desde a pa (2,4,6,8,10..) calcule a soma dos 100 primeiros termos

Answer 1

r=4-2
r=2
a100=a1+(N-1)r
a100=2+99×2
a100=2+198
a100=200
S100=(a1+a100)100/2
S100=(2+200)50
S100=202×50
S100=10100