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In class XI of a school 40% of the stude...

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 or both.

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In Class XI of a school 40 % of the students study Mathematies 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 Mathemetics or Biology.

In Class XI of a school 40 % of the students study Mathematies 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 Mathemetics or Biology.

In Class XI of a school 40 % of the students study Mathematies and Biology. If a student is selected at random from the class, find the probability that he will be studying Mathemetics or Biology.

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In a class, 30% of the students offered mathematics, 20% offered chemistry and 10% offered both. If a student is selected at random, find the probability that he has offered mathematics or chemistry.