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If repeated digits are allowed, then the largest 12-digit number is 999,999,999,999 .

If repeated digits are not allowed, then the largest 12-digit number is 989,898,989,898 .

If the same digit can't be used more than once, then the largest possible number has only

10 digits. The number is 9,876,543,210 .

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Q: The largest 12- digit numbers where repeated digits are allowed?

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999,999,999,999

The largest number with no repeated digits is 9,876,543,210 although it is 10 digits long, the largest 3 digit number with no repeated digits is 987

The largest ten digit number with no repeated digits is '9876543210'.

Use the highest possible digit (9) for all 12 digits.

987654

If the digits may not be repeated, there are 6x5x4x3x2x1 = 720 numbers, If digits can be repeated, the answer is 6x6x6x6x6x6 = 46,656 numbers If zero is ong the available digits but is excluded from the first place. 5x6x6x6x6x6=38,880 numbers

The largest 10-digit number with no digit repeated is 9876543210 !

97531

987654

987654

9,999,999,999

There are 4 possible numbers if the digits are not repeated; 18 if they are. Those are 3-digit numbers, assuming that zero would not be a leading digit. If zero is allowed for a leading digit, then you can have 6 for the non repeated, and 27 if repetition.

Repeated twice means we're allowed three of them. That would be 88,866,644. If you really meant repeated, that would be 88,664,420

763920

100,000,000,000

111,111,111,111

757

It is possible to create a 3-digit number, without repeated digits so the probability is 1.

9876

There are 5*4*3 = 60 such numbers.

24

500

With repeated digits, 43 = 64 Without repeated digits, 4*3*2 = 24

This permutation problem depends on whether the numbers are allowed to be repeated. If they are, there are a possible 9999 numbers, starting with 0001 and running sequentially to 9999. If they are not allowed to be repeated, there are a possible 5040 combinations.

Simply rearranging the digits, the largest number is 5432. Much larger numbers are possible if other operations are allowed.