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Instructions

Consider the $$6 \times 6$$ square in the figure. Let $$A_1, A_2, \ldots, A_{49}$$ be the points of intersections (dots in the picture) in some order. We say that $$A_i$$ and $$A_j$$ are friends if they are adjacent along a row or along a column. Assume that each point $$A_i$$ has an equal chance of being chosen.

Question 16

Let $$p_i$$ be the probability that a randomly chosen point has $$i$$ many friends, $$i = 0, 1, 2, 3, 4$$. Let $$X$$ be a random variable such that for $$i = 0, 1, 2, 3, 4$$, the probability $$P(X = i) = p_i$$. Then the value of $$7E(X)$$ is

image


Correct Answer: 24

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