30. A ball is thrown at a square that is divided into n2 identical squares. The probability...

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30. A ball is thrown at a square that is divided into n2 identical squares. The probability that the ball hits the square of the ith column and jth row is pij , where Pn i=1 Pn j=1 pij = 1.

In terms of pij ’s, find the probability that the ball hits the jth horizontal strip.

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