NO.PZ2018062016000072
问题如下:
For a portfolio including four securities, how many distinct covariance terms are needed to compute the portfolio variance of return?
选项:
A. 6
B. 12
C. 4
解释:
A is correct. For four securities, there are 4*(4-1)/2=6 distinct covariance terms to estimate.
4 C 2应该也对吧? 它题里面的解题思路可以解释下吗?没看懂