The number of digits in the smallest number, which when multiplied by 7 yields a

Question

The number of digits in the smallest number, which when multiplied by 7 yields all nines, is :

Options:

A . 3

B . 4

C . 5

D . 6

Answer: Option D
We keep on dividing 99999..... by 7 till we get 0 as remainder.
∴ Required number = 142857
Number of digit = 6

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