Determine the covariance and correlation for X1 and X2 in

Determine the covariance and correlation for X1 and X2 in

Determine the covariance and correlation for X1 and X2 in the joint distribution of the multinomial random variables X1, X2 and X3 in with p1 = p2 = p3 = 1/3 and n = 3. What can you conclude about the sign of the correlation between two random variables in a multinomial distribution?

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