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