Composed of three digits as required, and 3 0 4 2 as required to form three digits 1 odd number?

1) Odd number, do you know what an odd number is? The so-called odd number refers to the number of natural numbers that are not divisible by 2; Therefore, to ensure that a three-digit number is an odd number, you need to ensure that the single digit of the number is an odd number; In this way, using four numbers to form a three-digit number should first ensure that the single digit is 7, and then as long as the hundred digit is not 0, the number can be formed. The emphasis here is that the hundred digit is not 0 because 0 is not a triple number in the first place.

So at least these;

2) Even numbers, it is also necessary to be clear what is an even number, the so-called even number refers to a number that can be divisible by 2. For this topic. As long as you don't have a 7 in the single digit and not 0 in the 100 digit. You can write whatever you want;

3) Multiples of 3: This may seem a bit more difficult, but as long as you understand the characteristics of numbers divisible by 3, the problem is easy. So what are the characteristics of a number divisible by 3?

If the sum of the numbers on each number is divisible by 3, then the number is divisible by 3, and knowing this, you should know that it is a number that satisfies the conditions of the problem;

4) It is both a multiple of 2 and a multiple of 5, to put it bluntly, this number should be a multiple of 10, so a single digit is a number of 0.

All right. Some places are not written directly. However, reading requires care, not care, and no matter how much you say, it is false.

Odd number: 267,627

Even numbers: 276, 672, 602, 620, 702, 726, 270, 720, 762

Both a multiple of 2 and a multiple of 5: 620, 720, 260, 270

Odd numbers that use 3, 0, 4, 2 to form a three-digit number are: 403, 423, 203, 243

Requirement one is the odd number 4305, 4053 requires the second is the even number 3540, 3504, 5034, 3450, 5430, requires three is a multiple of 2 3054, 3504, 5034, 5430, requires four is a multiple of 5 4305, 4035, 3045, 3405, requires five is a multiple of 3 5430, 5403, 3450, 4530,

6 pcs. Solution: 1,2,3 can be composed of three digits:

1) The number of 1 in the hundred place is: 123,132, 2) 2 The number in the hundred place is: 213,231, 3) 3 The number in the hundred place is 321,312

So the numbers 1, 2, and 3 can be formed into 6 three-digit numbers without repeating numbers.

, so this one counts as one.

must be a multiple of 99.

There are 189 numbers, 100-199, 200-299All are 300 numbers offset with 9, 189 + 300 + 300 + 300 + 300 + 300 + 300 1990 numbers start from 800, 8008018028 9 more than 8The offset is very simple: 1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9 are all multiples of 9, 10-19, and 9 one offset is left with 1-9 offset.

20-29, 9 2 offset.

You've got to choose me!

Three digits that can make up multiples of 8 3s:

Note that card 6 can also be used as a 9.

3405 composed of 3 digits, at the same time is a multiple of , so this number should meet the multiple characteristics of 3, and the single digit must meet the characteristics of 2 and 5, that is, the single digit must be 0, the sum of all digits is a multiple of 3, 3+4=7, 3+5=8, 7 and 8 are not multiples of 3, 4+5=9, 9 is a multiple of 3, so this three-digit number is 450.

If they are multiples of , then multiples of 2 have , multiples of 3 have , and multiples of 5 have .

To meet a multiple of 2,5, the mantissa must be 0.

If it is a multiple of 3, then the sum of the remaining two numbers needs to be a multiple of 3.

So the three-digit number is 540,450