There are 5*4*3 = 60 such numbers.
pizza
There are 5 numbers of 1 digit, 25 numbers of 2 digits, and 75 numbers of 3 digits. This makes 105 numbers in all.
To form a 5-digit number using the digits from 1 to 9 (without the digit 0) and allowing repetitions, each position in the number can be filled by any of the 9 digits. Therefore, for each of the 5 positions, there are 9 possible choices. Thus, the total number of 5-digit numbers that can be formed is (9^5 = 59,049).
Allowing repetitions, there are 9 combinations. Without repeated digits, there is only one combination of 3 digits from 3.
2
27 three digit numbers from the digits 3, 5, 7 including repetitions.
24 three digit numbers if repetition of digits is not allowed. 4P3 = 24.If repetition of digits is allowed then we have:For 3 repetitions, 4 three digit numbers.For 2 repetitions, 36 three digit numbers.So we have a total of 64 three digit numbers if repetition of digits is allowed.
pizza
There are 5 numbers of 1 digit, 25 numbers of 2 digits, and 75 numbers of 3 digits. This makes 105 numbers in all.
2,401
To form a 5-digit number using the digits from 1 to 9 (without the digit 0) and allowing repetitions, each position in the number can be filled by any of the 9 digits. Therefore, for each of the 5 positions, there are 9 possible choices. Thus, the total number of 5-digit numbers that can be formed is (9^5 = 59,049).
It is possible to create a 3-digit number, without repeated digits so the probability is 1.
10,000
The number of six digit numbers that you can make from ten different digits ifrepetitions of same digit on the six digit number is allowed is 1 000 000 numbers(including number 000 000).If no repetitions of the the same digit are allowed then you have:10P6 = 10!/(10-6)! = 151 200 different six digit numbers(six digit permutations form 10 different digits).
5040 different 4 digit numbers can be formed with the digits 123456789. This is assuming that no digits are repeated with each combination.
Allowing repetitions, there are 9 combinations. Without repeated digits, there is only one combination of 3 digits from 3.
2