Q10 of 104 Page 491

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: =


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