Given the geometric Series:

1/5 + 1/25 + 1/125 + .........

(a) Find the next two terms.

(b) Determine if it is possible to find s∞.

(c) If possible, find s∞ and then express this sum using the sigma notation.

Any help guys? I can understand that the next term will be 1/625 and then 1/3125? but I can't understand b and c.