a. A portfolio is invested in a very large number of shares (n is large). However, one-half of the portfolio is invested in stock 1, and the rest of the portfolio is equally divided among the other n − 1 shares. Is this portfolio well diversified?

b. Another portfolio also is invested in the same n shares, where n is very large. Instead of equally weighting with portfolio weights of 1/n in each stock, the weights in half the securities are 1.5/n while the weights in the other shares are .5/n. Is this portfolio well diversified?