Question

The simple value of1\2+1\6+1\12+1\30+1\42+1\56+1\72+1\90 is

Answer 1

l.c.m of 2,6,12,30,42,56,72,90 is 2520
so the above solution =(1260+420+210+84+60+45+35+28)/2520
=2142/2520
=1071/1260
=357/420
=119/140