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In a school 25% students are failed in M...

In a school 25% students are failed in Mathematics, 15% in Physics and 5% students fail in both Mathematics and Physics. A student is selected at random.
(i) If he is fail in Physics, find the probability that he is fail in Mathematics.
(ii) If he is fail in Mathematics, find the probability that he in fail in Physics.
(iii) Find the probability that he is fail either in Mathematics or in Physics.

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