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angka terbesar = Un = 200
b = 4
Un = a + (n - 1).b
200 = 4 + (n - 1).4
200 = 4 + 4n - 4
200 = 4n
n = 50
Sn = (a + Un)
S50 = (4 + 200)
= 25 (204)
= 5100