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OpenStudy (anonymous):
Find S10 for (-1) + (-7) + (-13) + (-19) +...
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OpenStudy (ryan123345):
Hint. Adding by a -6
Parth (parthkohli):
Err, of course. @CommitingSins790 What is hard with this problem?
Parth (parthkohli):
\[S_n = \dfrac{n}{2}\left(2a_1 + (n - 1)d\right)\]
OpenStudy (ryan123345):
Exactly :) @ParthKohli
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