How many four digit numbers are composed of 1.2.3.4.5 without repetition? How many even numbers are there?

1234 1243 1324 1342 1423 1432 2134 2143 2314 2341 2413 2431 3214 3241 3124 3142 4123 4132 4213 4231

RELATED INFORMATIONS

1. Use the five numbers 1.2.3.4.5 to form a three digit number without repetition. How many even numbers are there?
2. Use the numbers 0, 1, 2, 3 and 4 to form a five digit number without repetition, then how many even numbers are adjacent to the numbers 1 and 2?
3. Use the five numbers of 0, 1, 2, 3 and 4 to form the five digit number without repetition, in which the even number has
4. A three digit number is not only a multiple of 3, but also a factor of 5. If the number is odd, the minimum is (), if it is even, the maximum is ()
5. A three digit number is not only a multiple of 3, but also a factor of 5. If the number is odd, the minimum number is (?), and the maximum even number is (?)
6. A two digit number contains a factor of 3 and a multiple of 5. If the number is odd, what is the maximum; if it is even, what is the minimum I can't help you
7. Within 100 is not only a multiple of 3, but also a factor of 5, in which the largest odd number is (), and the smallest even number is ()
8. An odd number is a 2-digit multiple of 5. The sum of all its factors is 48. What is the number?
9. Add three numbers after 17 to form five digits, so that the five digits are even and have factors 3 and 5 at the same time?
10. For a three digit number, the number in the hundreds is 3 more than the smallest even number, and the number in the tens has only one factor. This three digit number is a common multiple of 2 and 5. What is it
11. If you take any one of the three digits of 3, 2 and 1, what is the possibility of getting an even number______ ．
12. The numbers 2, 3, 7 and 8 can be made up______ There are four digits without repetition, in which the possibility of the singular is______ What's the possibility of even numbers______ ．
13. The second section of chapter two in the eighth grade mathematics Dictionary (Beijing Normal University Edition) had better have a process
14. Calculation: 27-12 + 4 / 3
15. Calculate 15 × (- 3 / 5 + 1 / 3) - 27 × (1 / 6-5 / 12)
16. Comparison table of square root and arithmetic square root
17. Square root 3 [3x-2] = [2-3x] [x + 1] factor square root emergency
18. If x-3 and 3x-5 are the square roots of the same number, then the value of X is
19. It is known that ABC is a real number and B + C of a = C + a of B = a + B of C = K? If the title, seek detailed explanation
20. When the point m (x, y) moves in the triangle ABC (including boundary) as shown in the figure, the optimal solution of the maximum value of the objective function z = KX + y is (1,2), then the value range of the real number k is______ ．