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We can write five numbers each with 6 digits as follows;

456078

560784

607845

784560

845607

The number of 6 digits numbers that can be formed using the given digits is given by,

\[{5 \times 5 \times 4 \times 3 \times 2 \times 1}\]

The ${1}^{\text{st}}$ digit can be any of the digits except 0. The 2nd place can have any of the other 5 digits not used in the ${1}^{\text{st}}$ place. Similarly, the ${3}^{\text{st}}$, ${4}^{\text{st}}$, ${5}^{\text{st}}$ and ${6}^{\text{st}}$ place have any 4, 3, 2 and 1 of the given digits respectively. So, the total number of 5-digit numbers that can be formed using the given digits is,

\[{5 \times 5 \times 4 \times 3 \times 2 \times 1 = 600}\]