6,561
10,000
Assuming leading zeros are not permitted, then: If repeats are not allowed there are 30 possible numbers. If repeats are allowed there are 60 possible numbers.
Possible solutions - using your rules are:- 11,13,17,31,33,37,71,73 &77
There are twelve possible solutions using the rule you stated... 13,14,17,31,34,37,41,43,47,71,73 & 74
There are 60480 numbers.
The largest integer that can be formed by using the digits only once each and simply arranging them in some order is 8740. Otherwise, using exponents, much larger numbers are possible.
There are 4^6 = 4096 such numbers.
The possible combinations of pairs that can be formed using the keywords xy, xz, and yz are: xy, xz, and yz.
99999
To find the smallest odd number that can be made using the numbers 4, 5, 3, and 6, we need to consider all possible combinations. The odd numbers that can be formed are 3 and 5. The smallest odd number would be 3, which can be formed using the numbers 3 and 6 by ignoring the digit 6.
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.