$frac{100}{505}$+(1- $frac{1}{2}$).(1- $frac{1}{3}$).(1- $frac{1}{4}$)....(1- $frac{1}{1010}$)  ai giúp mik vs ;-;

$\frac{100}{505}$+(1- $\frac{1}{2}$).(1- $\frac{1}{3}$).(1- $\frac{1}{4}$)....(1- $\frac{1}{1010}$)  ai giúp mik vs ;-;
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