Find the sum of the following .(1-1÷n)+(1-2÷n)+(1-3÷n)+......up to n terms.

Find the sum of the following .(1-1÷n)+(1-2÷n)+(1-3÷n)+......up to

1.	Find the sum of the following .(1-1÷n)+(1-2÷n)+(1-3÷n)+......up to n terms.
Answer» -3n