Express 
as a rational number.
Let,x = 0.68686868…
⇒ x = 0.68 + 0.0068 + 0.000068 + …∞
⇒ x = 68(0.01 + 0.0001 + …∞)
⇒ x = 68(
+ …∞)
Here,a
and r = 
⇒ 
Ans: 
= 
1
Express as a rational number.
Let,x = 0.68686868…
⇒ x = 0.68 + 0.0068 + 0.000068 + …∞
⇒ x = 68(0.01 + 0.0001 + …∞)
⇒ x = 68( + …∞)
Here,a and r =
⇒
Ans: =