Un = 4 x n - 1
U50 = 4 x 50 - 1
= 199
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a = 3
Un = a+(n-1)b
U50 = 3 + ( 50-1 )4
U50 = 3 + (49)4 --> perkalian duluan diselesaikan ( 49x4 )
U50 = 3 + 196
U50 = 199
Un = 4 x n - 1
U50 = 4 x 50 - 1
= 199