How-many-digits-are-present-in-periodic-part-for-decimal-expansion-of-1-7-11-

Question Number 427 by 9999 last updated on 25/Jan/15

How many digits are present in

periodic part for decimal expansion

of \frac{1}{7^{11}} ?

Commented by 123456 last updated on 02/Jan/15

10^{n} \equiv 1 ({\mod 7}^{11})

Answered by prakash jain last updated on 02/Jan/15

6 \times 7^{10}