SOLUTION: How to find the sum of 2+4+6+8+...+130+132

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Question 987846: How to find the sum of 2+4+6+8+...+130+132
Answer by stanbon(75887) About Me  (Show Source):
You can put this solution on YOUR website!
How to find the sum of 2+4+6+8+...+130+132
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Aritmetic series with a(1) = 2 and d = 2
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a(n) = 2 + (n-1)2 = 132
(n-1)2 = 130
n-1 = 65
n = 66
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S(n) = (n/2)(a+a(n))
S(66) = 33(2+132) = 33(134) = 4422
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Cheers,
Stan H.
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