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Please explain the answers to me in steps , thank you a)3 female students and 7 male students are nominated for scholarships.All 10 students are

Please explain the answers to me in steps , thank you

a)3 female students and 7 male students are nominated for scholarships.All 10 students are equally qualified and equally likely to be chosen.You may assume any person can receive a maximum of one scholarship.You are awarding a total of 3 scholarships.What is the probability that all the scholarships are given to females?

b)An urn contains 4 red, 6 green, and 2 yellow balls.If 3 balls are randomly selected what is the probability that you pick one of each color?

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