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How Many Numbers Can Be Formed Using a Certain Number of Digits?

Question

Find a smallest three digit number using the digits $4, 7, 9$
$974$
$497$
$479$
$794$

A

794

B

479

C

974

D

497

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Solution

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Smallest three digit number which can be formed is if we arrange them in ascending order, i.e. $479$

Hence $479$ is the smallest three digit number.

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