Question

N= 1/2 +1/6+ 1/12+1/20+1/30+......+1/156, what is the value of N​

Answer 1

Answer:

an=1/156

n=52/129

Sn=A+(n-1)d

=1/2+(52/129-(1))-1/3)

1/2+((52-129)/129)-1/3

=1/2+(77/387)

=541/774