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What is the sum of the first 10 terms of the sequence defined by an = 2n - 3?

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a = a_₁ = 2*1-3 = -1
d = a_{_n+1}-a_{_n} = (2(n+1)-3)-(2n-3)) = 2

Now just use your sum formula

S10 = 10/2 (2a+9d)

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