sol the questions

Problem 2.2. [2) Assume that a riskless asset does not exist. Prove that any minimum-variance (m-v) portfolio may be considered as a linear combination of the portfolios V IR 1TV 'R and V-11 17V-'1 Identify these portfolios. Problem 2.3. [1] From the Minimum Variance Frontier Figure in the lecture note and Constantinides- Malliaris Chapter] Show algebraically, that when you draw a line from crossing any minimum variance efficient portfolio p and global minimum variance portfolio G, the return of the orthogonal portfolio R= = b-ER. a-bre is on the y-axis (returns). Assume p / G. Use the notations from the note/chapter/figure. Problem 2.4. [1) [True/False/Uncertain] The risk of security i in portfolio p is cov(R;, Ro), which is the covariance of the security's return with the return on the portfolio. Does this mean that the variance of a security's return has no role in the risk of i in p