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OpenStudy (anonymous):
what is the sum of the first 41 even numbers
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Vocaloid (vocaloid):
use the sum formula for arithmetic sequences S = (n/2)(2a + (n-1)d) n = 41, a = 0, d = 2
OpenStudy (loser66):
\(\sum_{n=1}^{41} 2n = 2\sum_{n=1}^{41} n = 2*\dfrac{41(41+1)}{2}= 41*42 =....\)
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