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b = 14-7 = 7
U terakhir = 161
Un = a+(n-1)b
Un = 7 + (n-1)7
Un = 7 + 7n - 7
Un = 7n
161 = 7n
n = 161/7
n = 23
Sn = n/2 (a+Un)
S23 = 23/2 (7 + 161)
S23 = 11,5 (168)
S23 = 1932 (c)