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beda = 3
Un = a + (n - 1)b
U50 = 2 + (50 - 1)3
= 2 + (49)3
= 2 + 147
= 149
U1 = a = 2
b = U2 - U1 = 5 - 2 = 3
Un = a + (n-1)b
U50 = 2 + (50-1)3
= 2 + (49)(3)
= 2 + 147
= 149
suku ke-50 adalah 149