Answer :

Let x = 5.4178178.... ……(i)

Here repetition is of 3 numbers; 1, 7, 8

So, we have to multiply x with 1000

⇒ 1000 × x = 1000 × 5.4178178...

⇒ 1000x = 5417.81781781... ……(ii)

Now, (ii) -(i) =

1000x = 5417.8178178...

x = 5.4178178...

⇒ 999x = 5412.4000........

Therefore,

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