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in Mathematics by (130k points)

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1 Answer

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by (10.9k points)
Let 1st term of AP be a

Its common difference

d = 3rd term - 2nd term = 18-14=4

So  a+d =14=> a=14-4=10

Sum of first 51 terms =51/2(2*10+(51-1)*4)

= 51×110=5610

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