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In a class 40% students read Mathematics,25% Biology and 15% both Mathematics and Biology.One student is selected at random. The probability that he reads Biology if he reads Mathematics is

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In a class 40% students read Mathematics,25% Biology and 15% both Mathematics and Biology.One student is selected at random. The probability that he reads Mathematics if it is known that he reads Biology is

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 probability that he will be studying Mathematics or Biology.

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