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banyaknya baris 6
b= 5
Un= a+(n-1)b
0 = 50 + (n-1). -5
0= 50 -5n +5
0 = 55 -5n
55 = 5n
n= 55/5 = 11
Sn = n/2 ( a + Un)
S11 = 11/2 (50 + 0) = 275