Question

calcule a soma dos 50 primeiros numeros pares positivos

Answer 1

(0,2,4,6,8,10,12,...98)
an=a₁+(n-1)r
an=0+(50-1)2
an=49.2
an=98

Sn=(a₁+an)n/2
S₅₀=(0+98)50/2
S₅₀=98.25
S₅₀=2450