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[" Let "T_(r)" be the "r^(" th ")" term of an A.P.,for "r=1,2,3,..." If for some "],[" positive integers "m,n" we have "],[qquad [T_(m)=(1)/(n)" and "T_(n)=(1)/(m)," then "T_(mn)" equals ",(1998-2" Marks")],[" (a) "(1)/(mn)," (b) "(1)/(m)+(1)/(n)," (c) "1," (d) "0]]

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