If the ratio of the sum of the first n terms of two APs is (4n +1) : (4n +27), find the ratio of their 9th terms.
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Here, n=9
So, 4n+1/4n+27
= 4(9)+1/4(9)+27
=37/63
Therefore the ratio of 9th terms is 37:63
So, 4n+1/4n+27
= 4(9)+1/4(9)+27
=37/63
Therefore the ratio of 9th terms is 37:63
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