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diketahui a = 100
U3 = 96
a + 2b = 96
100 + 2b = 96
2b = 96 - 100
2b = -4
b = -4/2 = - 2
Un = 0
a + (n-1)b = 0
100 + (n-1)(-2) = 0
(n-1)(-2) = -100
n-1 = -100/-2
n-1 = 50
n = 1+50
n = 51