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已知数列{an}满足an+1=a1-an-1(n≥2),a1=a,a2=b,设S...
已知数列{an}满足an+1=a1-an-1(n≥2),a1=a,a2=b,设Sn=a1+a2+…+an,则下列结论正确的是( )
A.a100=a-b,S100=50(a-b)
B.a100=a-b,S100=50a
C.a100=-b,S100=50a
D.a100=-a,S100=b-a
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