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3. (a) Suppose that stock A shares sell at $75 and stock B shares at $115. A portfolio has 300 shares of stock A and
3. (a) Suppose that stock A shares sell at $75 and stock B shares at $115. A portfolio has 300 shares of stock A and 100 of stock B. What are the weights w and 1 w of stocks A and B in this portfolio? (b) More generally, if a portfolio has N stocks, if the price per share of the jth stock is Pj, and if the portfolio has nj shares of stock j, then find a formula for w; as a function of n1,...,nn and P1, ...,Pn. NN
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