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OpenStudy (anonymous):
What is the sum of the arithmetic sequence 4, 11, 18 …, if there are 26 terms?
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hartnn (hartnn):
the first term a1 = 4 common difference d= 11-4 = 18-11 = 7 the sum to n terms (here n=26) is \(\huge S_n= (n/2)(2a+(n-1)d)\) just put the values.
OpenStudy (anonymous):
ok I did that and got 2379. is that right?
hartnn (hartnn):
yup, thats correct!
OpenStudy (anonymous):
ty :))
hartnn (hartnn):
welcome :)
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