# Let T_r be the r^(th) term of an A.P whose first term is a and common difference is d IF for some integer m,n, T_m=1/n and T_n=1/m then a

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Let T_r be the r^(th) term of an A.P whose first term is a and common difference is d IF for some integer m,n, T_m=1/n and T_n=1/m then a-d=
A. (1)/(m)+(1)/(n)
B. 1
C. (1)/(nm)
D. 0

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We have,
T_(m)=(1)/(n)andT_(n)=(1)/(m)
rArra+(m-1)d=(1)/(n)anda+(n-1)d=(1)/(m)
rArr a=d=(1)/(mn)rArra-d=0`.