Let A be a 3 x 3 matrix with independent and identically distributed entries (1). aij ~ Bernoulli i.e. each entry in A is 1 with probability 1/2, and 0 with probability 1/2, independently. k What is the probability that A has exactly 2 non-zero entries? Leave your answer as a simplified fraction. It may help to recall that = n! k!(n - k)!*

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