It is known that the sum of the first n terms of the sequence {an} and nS satisfies: Sm+Sn=Sm+n, and a 1= 1, then a 10=?

Solution: S2 = a1+a2 = 2s1= 2a1= 2.

So: a2= 1

Because: S3=S 1+S2=3.

So: a3= 1

And so on, a 10= 1.