Suppose you have three stocks A, B, C the three stocks have the same expected return and the same standard deviation. If you know that the correlation coefficient between each pair of stocks are as follows:
The correlation between A and B is +0.9
The correlation between A and C is 0.1
The correlation between B and C is -0.6
You want to form a portfolio consists of two securities Given the correlations above, a portfolio constructed of which pair of stocks will have the lowest standard deviation? What do you conclude?