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[" Let "a" ,be the "n''" term of an A.P.If "sum_(i=1)^(oo)a_(2r)=alpha" and "sum_(r=1)^(+oo)a_(2r-1)=beta," then the common difference of the "],[" AP.is "],[[" (1) ",beta-alpha]],[" (2) "(alpha-beta)/(200)],[" (3) "quad alpha-beta],[" (4) "(alpha-beta)/(100)]

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