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a= 204
b= 4
Un= a+(n-1)b
296= 204 +(n-1)4
296-204 = 4n-4
4n= 92+4
n= 96/4
n= 24
Sn= n/2 (a+Un)
S24= 24/2(204+296)
S24= 12(500)
S24= 6.000