Give the probability of the event $E=\{x_1,x_2\}$

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We have a probability experiment with sample space $\{x_1,x_2,x_3,x_4\}$ with $p(x_1)=27$, $p(x_2)=32$, $p(x_3)=17$, and $p(x_4)=17$

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