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[" Leta be the "n^(m)" term of an A.P.If "sum_(r=1)^(100)a_(2r)=alpha" and "sum_(r=1)^(100)a_(2r-1)=beta" ,then the common difterence of the A.P.is "],[[" (1) "alpha-beta," (2) "(alpha-beta)/(100)," (3) "beta-alpha," (4) "(alpha-beta)/(200)]]

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