Question: 15. (Annuity duration ) Find the duration D and the modified duration DM of a perpetual annuity that pays an amount A at the beginning

15. (Annuity duration ) Find the duration D and the modified duration DM of a perpetual annuity that pays an amount A at the beginning of each year, with the first such payment being 1 year from now. Assume a constant interest rate r compounded yearly. [Hint: It is not necessary to evaluate any new summations.]
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