# algebra 2

find the sum of the first 24 terms of the arithmetic sequence, if the first term is 3 and the commom difference is 3.

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1. Isnt there a formula for this? http://www.algebralab.org/lessons/lesson.aspx?file=Algebra_ArithSeries.xml

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bobpursley
2. sum(n) = n/2[2a + (n-1)d)

sum(24) = 12[6 + 23(3)]
= ....

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