Every one of the 5 digits can be either a 5 or a 9 so that means 2 choices for the first, 2 for the second digit, etc. There are 2^5 permutations of the numbers 5 and 9 in a 5 digits number.
7
99,997
11112
the largest five digit number that can be formed using the digits 7 and 9 is 97,000
A five digit number is a number consisting of five digits. eg. 12345 54321 98765
There are 1140 five digit combinations between numbers 1 and 20.
The answer will depend on how many digits there are in each of the 30 numbers. If the 30 numbers are all 6-digit numbers then the answer is NONE! If the 30 numbers are the first 30 counting numbers then there are 126 combinations of five 1-digit numbers, 1764 combinations of three 1-digit numbers and one 2-digit number, and 1710 combinations of one 1-digit number and two 2-digit numbers. That makes a total of 3600 5-digit combinations.
There are two choices (number 2 or number 3) for each of the five digits. The number of combinations is therefore, 2 x 2 x 2 x 2 x 2 = 32
99997
7
11112
99,997
If zero is permitted as the first digit then the number of combinations is 10 x 10 x 10 x 10 x 10 = 100000 If zero is not permitted then the number of combination is :- 9 x 10 x 10 x 10 x 10 = 90000
11112
A five digit number is a number consisting of five digits. eg. 12345 54321 98765
the largest five digit number that can be formed using the digits 7 and 9 is 97,000
All five digit numbers have three digits. The smallest five digit whole number is 10,000