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What is the greatest number which can be made using each of the digital 5,3,1,4,7

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-- By adding them, only one number can be made.
The number is 20 .

-- By multiplying them, only one number can be made.
The number is 420 .

-- By writing them, the biggest number that can be made is 75,431 .
The smallest one is 13,457 .

User Eyal Golan
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