Question

Answer 1

`A=(1-1/2)xx(1-1/3)xx(1-1/4)xx.....xx(1-1/2021)`

`=(2/2-1/2)xx(3/3-1/3)xx(4/4-1/4)xx......xx(2021/2021-1/2021)`

`=1/2 xx 2/3 xx 3/4 xx ...... xx 2020/2021`

`=(1xx2xx3xx.....xx2020)/(2xx3xx4xx.....xx2021)`

`=1/2021`

Answer 2

`= 1/2 xx 2/3 xx ... xx 2020/2021`

`= 1/2021`