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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 probability that he will be studying Mathematics or Biology.

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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 probability that he will be studying Mathematics or Biology.



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