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In a certain population, 10% of the people are rich, 5% are famous, and 3% are rich and famous. Then find the probability that a person picked at random from the population is either famous or rich but not both.

In a certain population, 10% of the people are rich, 5% are famous, and 3% are rich and famous. Then find the probability that a person picked at random from the population is either famous or rich but not both.

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Rita scored 20 marks more in Maths than the marks scored in English. Give an expression for: a. her marks in English if her marks in Maths are x. b. her marks in Maths if her marks in English are y.