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Let Tr be the rth term of an A.P. whose first term is a and common difference is d.

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Let Tr be the rth term of an A.P. whose first term is a and common difference is d. If for some positive integers m, n, m ≠ n, Tm = 1/n, and Tn = 1/m, then a – d equals

(a) 1/(mn)

(b) 1

(c) 0

(d) 1/m + 1/n.

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