A Question related to Probabilities

Правка en2, от ToujoursAffame, 2017-02-16 21:19:06

I saw this question on Hackerearth in a recent college contest .Link is here.(Editorial is not available).Can someone please help me here. I think this is related to linearity of expectation values ,But How do we model this problem in that way??? Please share your approach to this problem :) Thanks in advance ...

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en2 Английский ToujoursAffame 2017-02-16 21:19:06 8 Tiny change: 'e here. I know this is r' -> 'e here. I think this is r'
en1 Английский ToujoursAffame 2017-02-16 21:18:21 430 Initial revision (published)