The biggest 4 digit number formed by using each of the digits 5,7,8,9, without repetition is

9875

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9785

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8957

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8975

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Solution

The correct option is A
9875

To form a greatest number using the given digits, the digits are arranged such that their value keeps on decreasing as we move from left to right. Hence the required number will be 9875.

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_____ distinct 4-digit numbers can be formed using digits 4,3,2,1 once without repetition.

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