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= 12(2x5+(11x(-4)) / 2
= 6(10+(-44))
= 6(-33)
= -198
b= -4
S12 = n/2 (2a+(n-1)b) = 12/2(2x5+(12-1)x(-4))=6 (10+11x(-4)) =6 (10-44)=6(34) =204