Game theory exercise and uniform probability

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Could someone please explain how was b) solved ?

I really don't understand how was solved, I believe it has something to do with uniform probability applyed to the currect entry of the matrix.

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Let's see, for example, how the $\frac35$ in the upper left corner was derived. If $P_1$ hits issue $1$ and $P_2$ hits issue $3$, then whatever the actual percentage favoring $P_1$ had been, it will increase by 3%. So $P_1$ will win if the original percentage was more than 47%, which happens $$ \frac{50-47}{50-45} = \frac35 $$ of the time.