From any three of the four numbers 0, 1, 2 and 3, the probability that the number arranged by the three numbers is three digits and even is obtained

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• 1. Take any three of the ten natural numbers 1 and 2.10, then the largest of the three numbers is the probability of 3 When I figure it out, it's 1 / 20, but the answer is 1 / 120. Which one is right? Thank you
• 2. In the 10 natural numbers of 1,2,3... 9, take any 3 numbers, and find the probability that there are exactly two adjacent numbers in the 3 numbers
• 3. If three different natural numbers are given, the sum of two of them must be even. Why?
• 4. If three different natural numbers are given, the sum of two of them must be even. Why?
• 5. If three different natural numbers are given, the sum of two of them must be even. Why?
• 6. Can you put natural numbers 1-9 into the graph so that the sum of the three numbers in each row is even? fast
• 7. Fill the 9 natural numbers 1-9 in the table below, so that each horizontal, vertical, oblique and horizontal line has 159 boxes
• 8. Fill 1 to 16 in the 4 × 4 square so that the sum of all horizontal rows and all vertical columns is eight consecutive natural numbers,
• 9. If in 7 consecutive even numbers, the largest number is exactly 3 times the smallest number, then the largest number is equal to______ ．
• 10. Nine consecutive even numbers, the largest number is three times the smallest number, find the nine consecutive even numbers are how many
• 11. Take any four different numbers from 0123456789, and try to find the probability that they can be arranged into a four digit even number
• 12. In the ten natural numbers of 0.9, take any four different numbers to find the probability of forming a four digit even number
• 13. The probability that any four out of ten numbers 0,1,2,..., 9 can be arranged into an even four digit number It can be repeated
• 14. Take any two numbers from the four numbers 1, 2, 3 and 4, and calculate the probability that one of the two numbers is odd and the other is even
• 15. What is the probability that any one of the four numbers 0, 1, 2 and 3 is even?
• 16. There are five numbers 1,2,3,4,5. If you want to find any two of them, the sum of them is the probability of even numbers
• 17. From 1, 2, 3 In 2008, take any two numbers, then the sum of the two numbers is the probability of even numbers
• 18. The sum of three consecutive even numbers is sixty. What are the three numbers
• 19. It is known that the largest number in seven consecutive even numbers is three times of the smallest number
• 20. There are 7 consecutive even numbers. The maximum number is 3 times of the minimum number. Find these 7 numbers