With repetition, 94 = 6561.
Without repetition, 9*8*7*6 = 3024.
There are 60480 numbers.
There are 4^6 = 4096 such numbers.
If the digits are all different then 18. Otherwise, 192.
9 odd numbers less than 100 can be formed. They are: 3,5,7,35,37,53,57,73 and 75.
48 of them if digits may not be repeated. 100 if they can.
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.
To form a five-digit number using the digits 1, 2, 3, 4, and 5, each digit must be used exactly once. Since there are 5 unique digits, the total number of different five-digit numbers that can be formed is given by the factorial of the number of digits, which is 5! = 120. Therefore, 120 different five-digit numbers can be formed using the digits 12345.
15 of them.
27
Possible solutions - using your rules are:- 11,13,17,31,33,37,71,73 &77
6
There are 2000 such numbers.