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beda = b = 12-4 = 8
Un = a +(n-1)b
Un = 4 +(n-1)8
Un = 4 + 8n - 8
Un = -4 + 8n
Un = 8n - 4
180 = 8n - 4
180+4 = 8n
184 = 8n
n = 184/8
n = 23
Sn = n/2 (a + Un)
S23 = 23/2 (4 + 180)
S23 = 23/2 (184)
S23 = 23 (92)
S23 = 2116