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OpenStudy (anonymous):
What is the sum of the arithmetic sequence 3, 9, 15…, if there are 24 terms?
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OpenStudy (anonymous):
a=3 ,d=6 ,n=24 apply the rule Sn=n/2(2a+(n-1)d)
OpenStudy (anonymous):
where a = first term d=difference between every two terms ,n =number all terms
OpenStudy (anonymous):
so 1728?
OpenStudy (anonymous):
right :)
OpenStudy (anonymous):
thanks so much!
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OpenStudy (anonymous):
yw.
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