Question

(1- 1/2] *[1- 1/3]*[1- 1/4]*[1- 1/4]*[1- 1/5]

Answer 1

( 1- 1/2 ) * ( 1 - 1/3 ) * ( 1 - 1/4 ) * ( 1 - 1/4 ) * ( 1 - 1/5 )

= 1/2 * 2/3 * 3/4 * 3/4 * 4/5

= 72/480

= 9/60

Answer 2

\(\left(1-\frac{1}{2}\right)\times\left(1-\frac{1}{3}\right)\times\left(1-\frac{1}{4}\right)\times\left(1-\frac{1}{4}\right)\times\left(1-\frac{1}{5}\right)\)

\(=\frac{1}{2}\times\frac{2}{3}\times\frac{3}{4}\times\frac{3}{4}\times\frac{4}{5}\)

\(=\frac{1.3}{4.5}=\frac{3}{20}\)

Answer 3

( 1 - 1/2 ) * ( 1 - 1/3 ) * ( 1 - 1/4 ) * ( 1 - 1/4 ) * ( 1 - 1/5 )

= 1/2 * 2/3 * 3/4 * 3/4 ( 4/5

= 72/480

= 9/60

Answer 4

\(\text{Ta có: }\)\(\left(1-\frac{1}{2}\right)\times\left(1-\frac{1}{3}\right)\times\left(1-\frac{1}{4}\right)\times\left(1-\frac{1}{4}\right)\times\left(1-\frac{1}{5}\right)\)

              \(=\frac{1}{2}\times\frac{2}{3}\times\frac{3}{4}\times\frac{3}{4}\times\frac{4}{5}\)

                 \(=\frac{1\times2\times3\times3\times4}{2\times3\times4\times4\times5}\)

                     \(=\frac{1\times3}{4\times5}\)

                      \(=\frac{3}{20}\)