Aspider has one shoe and one sock for each of its eight legs. in how many different orders can the spider put on its socks and shoes, assuming that on each leg the sock must be put on before the shoe? (for avoidance of doubt, a spider will not be putting its 5th leg sock on its 3rd leg.)

Consider a treasury bill with a rate of return of 5% and the following risky securities: security a: e(r) = .15; variance = .0400 security b: e(r) = .10; variance = .0225 security c: e(r) = .12; variance = .1000 security d: e(r) = .13; variance = .0625 the investor must develop a complete portfolio by combining the risk-free asset with one of the securities mentioned above. the security the investor should choose as part of her complete portfolio to achieve the best cal would be a. security a b. security b c. security c d. security d