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There are 9*9*8*7 = 4536 such numbers.

Q: How many 4-digit numbers can be formed by the digits 0 1 2 3 4 5 6 7 8 9 using the digits once?

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99999

There are 3,265,920 numbers that can be formed using all the digits. The answer to the question will depend on which one of these.

15 of them.

27

Possible solutions - using your rules are:- 11,13,17,31,33,37,71,73 &77

Related questions

99999

There are 3,265,920 numbers that can be formed using all the digits. The answer to the question will depend on which one of these.

There are 60480 numbers.

There are 4^6 = 4096 such numbers.

8.

If the digits are all different then 18. Otherwise, 192.

There are 900 of them.

15 of them.

Assuming each of the given digits can be used only once, the answer is 24. If not, the answer is infinity.

27 if the digits can be repeated. 6 if not.

27

Possible solutions - using your rules are:- 11,13,17,31,33,37,71,73 &77