if the ratio of sum of first n term of two ap is (7n+ 1 )ratio (4n+ 27) then find the ratio of the 9 term
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sn1/sn2=(7n+1)/(4n+27)
s91/s92=7*9+1/4*9+27
=64/63
s91/s92=7*9+1/4*9+27
=64/63
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