hitunglah jumlah deret geometri tsb hingga a.10+50+25+... b.5+1+1/2+...

jawab

a)  10 + 50 + 25+ ...
s~ = 10 +  { 50 /(1 - 25/50)}
s~ = 10 +  {50 /(1/2)}
s~ = 10 + 100
s~ = 110

b)   5 + 1 + 1/2 + ...
s~ = 5 + ( 1 / ( 1 - 1/2))
s~ = 5  + (1 / (1/2))
s~ = 5 + 2
s~ = 7