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Write the greatest and smallest 4-digit numbers with different digits. 

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To form greatest 4-digit number with different digits, choose larger digits as 9,8,7,6 and arrange them in descending order forming $9876$.

To form smallest 4-digit number with different digits, choose smaller digits like 0,1,2,3 but 0 cannot be placed first. So, number formed is $1023$.

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Saniya Khatri

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