Expected Help for Expected value

Правка en1, от LIFE_GOES_ON, 2020-05-04 21:24:11

In this atcoder problem,I do not understand how to approach. I am weak at expected value and probabilities . Please suggest me any good source to learn expected value from the beginning .

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en1 Английский LIFE_GOES_ON 2020-05-04 21:24:11 264 Initial revision (published)