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How do you solve for covariance? Can you provide an example(s) on how to solve the...

How do you solve for covariance? Can you provide an example(s) on how to solve the following three problems:

Cov(7X,Y)=

Cov(X, 4Y)=

Cov(.05X, .2Y)=

Math   Statistics-And-Probability   
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