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[" THEORY BITS "],[" If "a(1),a(2),a(3),...

[" THEORY BITS "],[" If "a_(1),a_(2),a_(3),......a_(n+1)" are in A.P.,of non zero "],[" terms then "(1)/(a_(1)a_(2))+(1)/(a_(2)a_(3))+......(1)/(a_(n)a_(n+1))," is "]

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