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OpenStudy (anonymous):
Find Sn for the given arithmetic series. a1=18, d=-10, n=12
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hartnn (hartnn):
The formula to calculate sum for AP is \(\huge S_n=n/2(2a_1+(n-1)d)\) now just plug in the values, u will find the sum....
hartnn (hartnn):
@kristina95 did u try plugging values in that formula? do u need further help ?
OpenStudy (anonymous):
so would it be -444? or am I doing something wrong
hartnn (hartnn):
thats correct! its -444. thats your sum :)
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