Interview Q&A / Aptitude

1. A bag has 5 red and 3 blue balls. Two balls are drawn at random without replacement. What is the probability that both are red?

   5/14. First red: 5/8. Second red, given the first was red: 4/7. Multiply: 5/8 x 4/7 = 20/56 = 5/14. Using combinations: C(5,2)/C(8,2) = 10/28 = 5/14.

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