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- 1 1 year Liaoning college entrance examination mathematics
1 1 year Liaoning college entrance examination mathematics
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.
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