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a) If the probability that $A$ wins exactly $k$ matches in the series is $0.888$. What's the value of $k$?

b) What's the probability that $A$ wins at least two matches?

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I ain't good with these stuff, so I hope you guys may help me please.

The part a) states that $A$ could win 2, 3, 5 or 8 matches and the probability is the same, is this assumption correct? How to find the value of $k$?

As for b), how can I compute the asked probability? I know that $A$ has probability of wining any of the patches with value $0.2$, but when it says "at least," I can understand it.

Thank you.