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.
manasiriya2003:
Plz solve it ....
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Yh but it seems to be very complicated...and other solution u have??
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7(2m–1)+1:4(2m–1)+27
7(2×9–1)+1:4(2×9–1)+27
7(18–1)+1:4(18–1)+27
7×17+1:4×17+27
119+1:68+27
120:95
24:19
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