POLP2019 , Expected Value

For this question - https://www.codechef.com/POLP2019/problems/EXPVAL
Why my solution gives WA - https://www.codechef.com/viewsolution/23410896
and all this solution gives AC - https://www.codechef.com/viewsolution/23409940 ,
https://www.codechef.com/viewsolution/23407550 .
Please help!

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4 decimal exact matching will depend on setter’s code. Because of this issue even the correct solution will get WA. I think all the solutions should be rejudged!

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