the sum of n terms of an ap is 2n^2.find the 5th term
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5th term of an AP series = S5 - S4
= 2(5)^2 - 2(4)^2
= 50 - 32
= 18
= 2(5)^2 - 2(4)^2
= 50 - 32
= 18
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