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Consider selecting one ball at a time from a box which contains 10 red, 6 yellow and 4 blue balls. What is the probability that

Consider selecting one ball at a time from a box which contains 10 red, 6 yellow and 4 blue balls. What is the probability that the first ball is red and the second ball is also red? Express the probability in fraction format.

(a) Assuming the ball selection is without replacement.

(b) Assuming the ball selection is with replacement.

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