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Find an approximation of (0.99)^5 using ...

Find an approximation of `(0.99)^5` using the first three terms of its expansion

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`(0.99)^5 =(1-0.01)^5= ^5 C_0- ^5 C_1(0.01)+ ^5 C_2(0.01)^2+. . . .
=1-5 xx 0.01+10 xx 0.0001+. . . .
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