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the fourth terms of an AP is 37 and the 6th terms is 12 more than the fourth term.Find the first and seventh terms.

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clearly d=6, since a6 = a4+12 = a4+2d
so, since a4=a+3d=a+18=37, a=19

a1=a=19
a7=a+6d=19+6*6=44

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