Question

Soma da pa 3,6,9.... 300

Answer 1

Resposta:

r=a2-a1=6-3=3

an=a1+(n-1)*r

300=3+(n-1)* 3

300=3+3n-3

n=100

Sn=(a1+an)*n/2

Sn=(3+300)*100/2 = 15150