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b = 2
Sn = n/2 (2a+(n-1)b)
192 = n/2 (2x5 + (n-1) 2)
192 = n/2 (10+2n-2)
384 = n (10+2n-2)
384 = 2n^2+10n-2n
384 = 2n^2+8n
maka n = 12