Question

CAUCULE A SOMA DOS TERMOS DA P.G (1,1/3, 1/9)

Answer 1

se forem so esses termos podemos fzr assim
sn=(a1+an).n/2
sn=(1+1/9).3/2
sn=(10/9.3)/2
sn=30/9/2
sn=15/9

espero ter ajudado rsrs