\(\left(1-\frac{1}{2}\right)\left(1-\frac{1}{3}\right)...........\left(1-\frac{1}{100}\right)\)
\(=\frac{1}{2}.\frac{2}{3}...........\frac{99}{100}\)
\(=\frac{1.2.3...........99}{2.3.4...........100}\)
\(=\frac{1}{100}\)
\(\left(1-\frac{1}{2}\right)\times\left(1-\frac{1}{3}\right)\times\left(1-\frac{1}{4}\right)\times...\times\left(1-\frac{1}{100}\right)\)
\(=\frac{1}{2}\times\frac{2}{3}\times\frac{3}{4}\times...\times\frac{99}{100}\)
\(=\frac{1}{100}\)