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OpenStudy (anonymous):
What is the sum of a 17–term arithmetic sequence where the first term is 7 and the last term is –105?
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OpenStudy (shubhamsrg):
i told you a formulla in last ques post.. remember?
OpenStudy (anonymous):
i can't find the post sorry. can you give me the formula again?
OpenStudy (anonymous):
@shubhamsrg
OpenStudy (shubhamsrg):
sum of n terms = n(first term + last term)/2
OpenStudy (shubhamsrg):
its just re modification of the traditional formulla.
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OpenStudy (anonymous):
ok thanks
OpenStudy (shubhamsrg):
glad to help ^_^
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