Question

P= 1/5+1/25+1/125+1/625+...

Answer 1

Rasio (r) = 1/5
        p = 1/5 + 1/25 + 1/125 + 1/625 + .......
1/5 · p = 1/25 + 1/125 + 1/625 + 1/3125 + .....  _
(1-1/5)p = 1/5
4/5 · p = 1/5
         p = 1/4
atau menggunakan rumus deret tak terhingga,

Sn = a/(1 - r) = (1/5)/(1 - 1/5) = (1/5)/(4/5) = 1/4