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OpenStudy (anonymous):
Find Sn for the given arithmetic series. a[1]=10, d=9, n=15 a. 1020 b. -1590 c. -795 d. -870
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OpenStudy (anonymous):
Sn = (n/2)[2a + (n-1)d]
OpenStudy (anonymous):
ie (15/2)[20 + 14*9]
OpenStudy (anonymous):
that comes to 7.5 * 146 = 1095 which is not 1 of the options
OpenStudy (anonymous):
i'm sure thats right
OpenStudy (anonymous):
thanks :)
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OpenStudy (anonymous):
yw
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