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OpenStudy (anonymous):
find sum of evens from 2 to 100
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OpenStudy (anonymous):
25(2+100)
OpenStudy (anonymous):
d=2
OpenStudy (anonymous):
now use the formula
myininaya (myininaya):
\[\sum_{i=1}^{50}2i=2\sum_{i=1}^{50}i=2*\frac{50(50+1)}{2}\]
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