Question

1/2+1/3+1/5+1/7

Answer 1

=105/210+70/210+42/210+30/210

=247/210

Answer 2

`1/2+1/3+1/5+1/7`

`105/210+70/210+42/210+30/210`

`=(105+70+42+30)/210`

`=247/210`

Answer 3

`= 5/6+1/5+1/7=31/30+1/7=247/210`