if a=-18 and n=10 an =0 then find sn
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an = a+(n-1)d
0 = -18+9d
9d = 18
d = 2
Sn = n/2[2a+(n-1)d
Sn = 5[-36+(9)2
Sn = 5[-36+18]
Sn = 5[-18]
Sn = -90 ans...
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