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suku ke 2 = 3x4
suku ke 3 =- 3x5
suku ke 50 = 3x(50+2) = 3x52 =- 156
suku petama = a = 9
beda = b = 3
suku ke n = an = a + (n-1)b
suku ke 50 = a + 49b
= 9 + 49×3 = 156
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