=2/n(n+ 1)

Original formula = 2/1* 2+2/2 * 3+2/3 * 4+...+2/99 *100.

=2( 1- 1/2+ 1/2- 1/3+ 1/3- 1/4+```+ 1/99- 1/ 100)

=2( 1- 1/ 100)

= 198/ 100

I just dialed the wrong number.