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misalkan suku pertama = a dan b = beda barisan
maka bilangan itu : a , (a+b) dan (a + 2b)
a + a + b + a + 2b = 3a + 3b = 24 ===> bagi dengan 3
a + b = 8
a = 8 - b
barisan geometri : (a-1) , (a+b-2) , (a + 2b)
berlaku :