99
Another Answer:-
99 = 387420489
If the digits are only used once, each, the largest possible number would be 97,531
The largest digits number with only 2 digits alike is 99
The largest even number less than 400,000,000 that can be formed using the digits 1 through 9 only once is 398,765,412. This number uses each of the digits from 1 to 9 exactly once and ends with the digit 2, making it even. Other combinations either exceed 400,000,000 or do not use all the digits exactly once.
To form the largest odd number less than 500,000 using the digits 5, 6, 0, 1, 3, and 9 each only once, we need to ensure the number is odd, which means it must end in 1, 3, or 9. The largest possible arrangement of the remaining digits while keeping the number under 500,000 is 39651. Therefore, the largest odd number less than 500,000 that can be formed is 39651.
This number is 9 999.Or maybe 9999 .
If the digits are only used once, each, the largest possible number would be 97,531
The largest digits number with only 2 digits alike is 99
99 is the largest two digit number. If I can use the digits anyway I want, then 9 to the 9th power is larger
Any number you want that doesn‘t have 2, 4, 6, 8, 0.
22412
It looks like you're asking what is the largest 4-digit number which has four 4's for digits - with a four digit number using four 4's, there is only one such number: 4444. Maybe I'm not understanding the wording of your question.
99.99
The largest even number less than 400,000,000 that can be formed using the digits 1 through 9 only once is 398,765,412. This number uses each of the digits from 1 to 9 exactly once and ends with the digit 2, making it even. Other combinations either exceed 400,000,000 or do not use all the digits exactly once.
To form the largest odd number less than 500,000 using the digits 5, 6, 0, 1, 3, and 9 each only once, we need to ensure the number is odd, which means it must end in 1, 3, or 9. The largest possible arrangement of the remaining digits while keeping the number under 500,000 is 39651. Therefore, the largest odd number less than 500,000 that can be formed is 39651.
This number is 9 999.Or maybe 9999 .
I suspect that it is 6^940 which is 731 digits long. The largest through reordering the digits is only 9640.
999,987,654