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Can you please explain why the answer is A, and not B or D? Also, what would be the answer if the correlation coefficient was

Can you please explain why the answer is A, and not B or D? Also, what would be the answer if the correlation coefficient was negative? image text in transcribed

Which of the following is a correct expression concerning the formula for the standard deviation of returns of a two asset portfolio where the correlation coefficient is positive? A. sigma^2 rp (W^2_1 sigma^2_1 + W^2_2 sigma^2_2)

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