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If the mth term of an A.P. is 1/n and nth term is 1/m, then the sum or first mn terms is .....

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If the mth term of an A.P. is 1/n and nth term is 1/m, then the sum or first mn terms is .....

(A) mn + 1

(B) (mn + 1)/2

(C) (mn - 1)/2

(D) (mn - 1)/3

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The correct option is: (B) (mn + 1)/2

Explanation:

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