Question

A = ( 1 - 1/2) . ( 1- 1/3) . ( 1-1/4 ) .( 1-1/5 ) . ....( 1-1/2018 ). ( 1-1/2019 )

Answer 1

A=(2/2-1/2) . (3/3-1/3) . ( 4/4 - 1/4 ) . (5/5 - 1/5) .... (2018/2018-1/2018). (2019/2019 - 1/2019)

A= 1/2 . 2/3 . 3/4 . 5/5 ..... 2017/2018 . 2018/2019

A= 1/2019

Answer 2

A = 1-1/2 . 1- 1/3 . 1-1/4 . 1-1/5 . ... . 1-1/2018 . 1-1/2019

   = 0 . 0 . 0 . 0 . ... . 0 . 0.

  = 0