18
12
20
16
14

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Express Then Now,remember there are at least two values of n satisfying the equality above,which leads to It means a=3 or 6, since 3 is a divisor of a and 9b≤81 . a=3 gives b=2,c=1; a=6 gives b=8,c=4. Thus (a+b+c)max =18