Answer: 951
Explanation:
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To make the largest number with these three digits, make sure that:
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⇒ The largest digit is the first one;
⇒ The second largest digit is the second one;
⇒ The smallest digit is the last one
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⇒ largest digit : 9
⇒ 2nd largest : 5
⇒ smallest number : 1
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∴ Greatest number = 951