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| rev | Admin | (Created page with "'''Solution: E''' <math display="block"> X=100\left[(1+i)^{40}+(1+i)^{36}+\cdots+(1+i)^4\right]=\frac{\left.100 *(1+i)^4 *\left(1-(1+i)^{40}\right)\right)}{1-(1+i)^4} </math> <math display="block"> Y=A(20)=100\left[(1+i)^{20}+(1+i)^{16}+\cdots+(1+i)^4\right]=\frac{100 *(1+i)^4 *\left(1-(1+i)^{20}\right)}{1-(1+i)^4} . </math> Using <math>X=5 Y</math> and using a difference of squares on the left side gives <math>1+(1+i)^{20}=5</math> so <math>(1+i)^{20}=4</math> s...") | Nov 26'23 at 17:36 | +923 |