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Use 0,1,2,3,4,5 to form three even numbers without repetition
According to the step-by-step principle, there are three possibilities (0, 2, 4) to fill in a digit (which must be even number), two of which are not zero (2, 4). At this time, one of the other four digits except (2 or 4 and 0) can be selected for the hundred digit, and one of the four digits except one digit and one hundred digit can be selected for the ten digit. The total number is 2 × 4 × 4 = 32
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- 1. What is the number of even three digit numbers with 0,1,2,3,4,5? Do this kind of problem have what knack? Can say analytic process?
- 2. How many even four digit numbers can be formed with 01234?
- 3. Ask a permutation question: how many six digit numbers can be made up of 3 odd numbers and 3 even numbers from the 10 numbers 0 to 9?
- 4. There are six numbers from 0 to 5. 1. How many numbers can be made up without repetition? ② How many even digits can be made up of 5 digits without repetition? ③ How many digits are larger than 24305 among the five digits that can be composed of no duplicate digits?
- 5. How many even four digit numbers () A. 6B. 10C. 12D. 24
- 6. How many even four digit numbers without repetition can be made up of the six numbers 0, 1, 2, 3, 4 and 5
- 7. Use 0,1,2,3 to form the even number of three digits without repetition kuai
- 8. What is the result of adding 1 to the third power of 2 and 3 to the third power of 100?
- 9. square root The relationship between the resistance R, power P and the voltage u at both ends of an electrical appliance is p = u & # 178; △ R. the resistance of an electrical appliance is 15 Ω. Now the power of this electrical appliance is 1500 W. please help to calculate how much voltage the electrical appliance should be connected to?
- 10. We know that the square of X is equal to 18. When x is greater than 0, the integral part of X is () 2. If the square root of a number is x, the number greater than 5 is
- 11. With the six numbers of 0, 1, 2, 3, 4 and 5, we can make up even numbers without repetition
- 12. 0,1,2,3,4,5 are the even numbers of 3 digits without repetition?
- 13. How many 4 digits? How many odd numbers? How many even numbers?
- 14. What is the largest odd number and the smallest even number in the five digit system composed of 0,1,5,3,9?
- 15. 0,2,3,7 form a four digit number. What is the largest odd number and the smallest even number? At the same time, what is the largest four digit number of 2,3 multiples? What's the minimum number of four digits of 5 or 3 at the same time? At the same time, what is the maximum number of four digits of 2 or 5 times?
- 16. In a three digit number composed of any three numbers 0, 3, 6 and 9, the smallest number that is a multiple of 2 is (), the smallest odd number is (), and the largest even number is ()
- 17. The smallest five digits of a multiple of 3 are (12345) the largest even number () and the largest odd number
- 18. 0,1,2,3,... 9 ten digits constitute five digits. How many five digits are there with three odd digits and two even digits
- 19. From the four numbers of 0, 5, 6 and 7, randomly select three and form four different three digit numbers according to the requirements: odd number (); multiple of 3 (); even number (); multiple of both 3 and 10000 ()
- 20. The smallest odd number composed of four numbers 0.4.7.1 is () and the largest even number is ()