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a = 15
a-2 + a+2 = 2a = 30
misal a = bil ganjil . agar bil selanjutnya juga ganjil maka a+bilangan genap
a+(a+2)+(a+4)=45
3a+6 = 45
3a = 39
a = 13
bil terbesar = a+4 = i3+4=17
bil kecil = 13
jmlah = 13+17=30