if the ratio of the sum of the first n terms of two Aps is (7n+1): (4n+27), then find the ratio of their 9th terms.
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when n=9 ,
their ratio is
{7(9) + 1 } : { 4(9) + 27 }
{ 63+1 }. : { 36+27 }
64: 63
their ratio is
{7(9) + 1 } : { 4(9) + 27 }
{ 63+1 }. : { 36+27 }
64: 63
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