What is the value don’t just pick needs to be right!

To find the value of the given summation, we need to plug n=2,3,4,5,6 and find the value of the expression. And finally we need to add all of them .

When n=2, we will get 0.5 .

When n =3, we will get 1.

When n =4, we will get 3

When n =5, we will get 12

When n=6, we will get 60

Adding them, we will get 0.5+1+3+12+60 = 76.5

Therefore correct option is the last option .