The number of all four-digit numbers that can | vedclass

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(D) four-digit number has four places: thousands,hundreds,tens,and units.$1$. The thousands place cannot be $0$. Thus,it can be filled by any of the d

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$300$

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(D) four-digit number has four places: thousands,hundreds,tens,and units.$1$. The thousands place cannot be $0$. Thus,it can be filled by any of the digits $\{1, 2, 3, 4, 5\}$. There are $5$ choices.$2$. The hundreds place can be filled by any of the remaining $5$ digits (including $0$,excluding the one used in the thousands place). There are $5$ choices.$3$. The tens place can be filled by any of the remaining $4$ digits. There are $4$ choices.$4$. The units place can be filled by any of the remaining $3$ digits. There are $3$ choices.Total number of four-digit numbers $= 5 	imes 5 	imes 4 	imes 3 = 300$.

The number of all four-digit numbers that can be formed with the digits $0, 1, 2, 3, 4, 5$ when the repetition of the digits is not allowed,is

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