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Questions  >>  CBSE XI  >>  Math  >>  Probability
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In class XI of a school,40% of the students study mathematics and 30% study biology.10% of the class study both mathematics and biology.If a student is selected at random from the class.Find the probabilities that he will be studying mathematics or biology.

$\begin{array}{1 1}(A)\;60\%\\(B)\;50\%\\(C)\;40\%\\(D)\;35\%\end{array} $

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