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a= 1
b = 5-1 = 4
jawab
A. U20 = a+ (n-1) x b
U20 = 1 + (20-1) x 4
U20 = 1+ 76
U20 = 77
B. Un = 81
81 = 1 + (n-1)b
81 = 1+ (n-1) 4
81 = 1 + 4n - 4
81 = -3 = 4n
4n = 81 + 3
4n = 84
n = 84 / 4
n = 21