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Identifying Greatest /Smallest Number

The greatest ...

Question

The greatest four digit number that can be formed by the digits 4, 5, 7, 9 (repetition of digits is allowed).

A

9754

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B

7954

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C

5974

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D

9999

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Solution

The correct option is D 9999
Given digits : 4, 5, 7, 9

We know that,
$9 > 7 > 5 > 4$

Since repeatation of digits is allowed, all the four digits will be 9.
Hence, the greatest four digit number formed will be 9999.

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