1179 nha bn 

\(B=\left(1+\frac{1}{91}\right).\left(1+\frac{1}{92}\right).\left(1+\frac{1}{93}\right).....\left(1+\frac{1}{647}\right)\)

\(B=\frac{92}{91}.\frac{93}{92}.\frac{94}{93}.....\frac{648}{647}\)

\(B=\frac{92.93.94....648}{91.92.93....647}\)

\(B=\frac{648}{91}\)

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