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How many 3-digit numbers can be formed by using the digits 1 to 9 if no digit is repeated?.

Last updated date: 16th Mar 2023
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Hint: Make 3 blank spaces of ‘Ones’, ‘Tens’, ‘Hundreds’ and start checking how many numbers can be placed without repeating.

$\begin{array}{*{20}{c}} \_&\_&\_ \end{array} \\ {\text{H T O}} \\$