SOLUTION: what is the answer of 2+4+6....+56+58+60

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Question 199719: what is the answer of 2+4+6....+56+58+60
Answer by stanbon(75887) About Me  (Show Source):
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what is the answer of 2+4+6....+56+58+60
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Find the number of terms using a(n) = a(1) + (n-1)d:
60 = 2 + (n-1)2
58 = (n-1)2
n-1 = 29
n = 30
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Find the sum of the 30 terms using S(n) = (n/2)(1st + last)
S(30) = (30/2)(2+60)
S(30) = 15*62
S(30) = 930
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Cheers,
Stan H.