Using your rule - essentially, it's the simplified sum of 9999999-2000000 which is a total of 7999999 numbers !
81
It is 120 if the digits cannot be repeated.
823543
7
500
81
1 set
It is 120 if the digits cannot be repeated.
823543
7
There are 5! = 120 such numbers.
27 three digit numbers from the digits 3, 5, 7 including repetitions.
5040 different 4 digit numbers can be formed with the digits 123456789. This is assuming that no digits are repeated with each combination.
3x3x3=27
500
24
jfnvjsdkncjfdknvlakdjvbsadoihfcb shfvbcnsHLfc bnshJCbvjhbeshuyvbe b hdfbgehfgbwahucgbvfer fguy gyfuby uyr