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Prove that if a,b,c are positive numbers with sum of 18 , then

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Let a=a,b=a+1,c=a+2.        a+a+1+a+2=18.      3a+3=18.   a=5,b=6,c=7.          Then substitute the value for a,b,c in the equation given.you will find 0.2547

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