if the sum of all the terms of an AP : 1,4,7,10........x is 287 then find x

1 + 4 + 7 + 10 +.... + x = 287

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The ratio of the sum of n terms of two A.P.s is (7n+1):(4n+27).Find the ratio of their mth term.

Maths Project :make designs using arithmetic progression