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OpenStudy (anonymous):
find the sum of the first 10 terms of the arithmatic sequence a1=-43 d=12
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hartnn (hartnn):
the formula for the sum is (n/2)*(2a1+(n-1)*d) put n=10 and calculate
OpenStudy (anonymous):
n is 10 right
hartnn (hartnn):
yes
hartnn (hartnn):
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