tính tích: P=(1-1/2).(1-1/3).(1-1/4).........(1-1/999).(1-1/1000)
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\(P=\left(1-\frac{1}{2}\right).\left(1-\frac{1}{3}\right).................\left(1-\frac{1}{999}\right).\left(1-\frac{1}{1000}\right)\)
\(P=\frac{-1}{2}.\frac{-2}{3}.......................\frac{-998}{999}.\frac{-999}{1000}\)
\(P=\frac{\left(-1\right).\left(-2\right)...............\left(-998\right).\left(-999\right)}{2.3........................999.1000}\)
\(P=\frac{-1}{1000}\)
\(\left(1-\frac{1}{2}\right).\left(1-\frac{1}{3}\right).\left(1-\frac{1}{4}\right).....\left(1-\frac{1}{999}\right).\left(1-\frac{1}{1000}\right)\)
\(=\frac{1}{2}.\frac{2}{3}.\frac{3}{4}.....\frac{998}{999}.\frac{999}{1000}\)
\(=\frac{1.2.3.....998.999}{2.3.4.....999.1000}\)
\(=\frac{1}{1000}\)
\(P=\left(1-\frac{1}{2}\right)\left(1-\frac{1}{3}\right)\left(1-\frac{1}{4}\right)...\left(1-\frac{1}{999}\right)\left(1-\frac{1}{1000}\right)\)
\(P=\frac{1}{2}\cdot\frac{2}{3}\cdot\frac{3}{4}\cdot...\cdot\frac{998}{999}\cdot\frac{999}{1000}\)
\(P=\frac{1\cdot2\cdot3\cdot4\cdot...\cdot999}{2\cdot3\cdot4\cdot5\cdot...\cdot1000}\)
\(P=\frac{1}{1000}\)
\(P=\frac{1}{2}\times\frac{2}{3}\times\frac{3}{4}\times...\times\frac{998}{999}\times\frac{999}{1000}\)
P=1/1000
_Kudo_