![](data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" viewBox="0 0 72 71" width="72"></svg>)
There are 158 cards in red and black. They are arranged in the order of five red cards and four black cards. What's the last color? Ask to explain + answer (urgent!
5+4=9
158 / 9 = 17, 5 is a red card
remainder
There are two kinds of cards, red and black. There are 158 cards in total. They are arranged in the order of five red cards and four black cards. The 100th card is () and the last card is what color?
5+4=9
100 / 9 = 11 more than 1 is a red card
remainder
There are two kinds of cards, red and black. There are 158 cards in total. They are arranged in the order of five red cards and four black cards. The 100th card is () color,
The last one is () color
5+4=9
100 = 9 * 11 + 1 red
158 = 9 * 17 + 5 black
There are 2012 balls in three piles. Each pile takes the same number of balls. There are 17 balls left in the second pile. The rest in the first pile is twice that in the third pile. How many balls are left in the third pile?
（2012-17）÷3=665
There are 10 red, yellow and blue balls of the same size and texture in the pocket. At least one time______ At least four balls are the same color
The worst case of this problem is to touch 3 balls of each color, then the next one will meet the requirements in any case, need: 3 × 3 + 1 = 10 (Times); answer: you should touch at least 10 times to ensure that at least 4 balls have the same color. So the answer is: 10
Put 10 balls of red, yellow, blue and green in one bag, and touch at least () balls, so that you can touch two balls of the same color?
Touch at least () balls, you can guarantee to touch three balls of the same color.
Five
As long as you touch nine balls, there are three of the same color
Put 10 red, yellow, blue and white balls into a bag, and feel 9 balls randomly. At least 3 balls have the same color. Explain the reason
Put 10 red, yellow, blue and white balls into a bag, and feel 9 balls randomly. At least 3 balls have the same color. Give it a try and explain the reason
Red, yellow, blue and white each 10. A total of 40 balls in a bag randomly grab out 9, at least three of the same color. That's necessary. The reason is that a total of four colors, you let out 9 can not have three of the same, that is, at most two 2x4 colors of the same color is equal to 8, and another one is necessary to jump out of these four colors And no matter jump out to take a group of three colors can be the same ball
There are 10 red, yellow and blue balls of the same size and texture in the pocket. At least one time______ At least four balls are the same color
The worst case of this problem is to touch 3 balls of each color, then the next one will meet the requirements in any case, need: 3 × 3 + 1 = 10 (Times); answer: you should touch at least 10 times to ensure that at least 4 balls have the same color. So the answer is: 10
There are 10 red, yellow and blue balls in one pocket, at least feel them out______ Only 10 balls can guarantee the same color
9 × 3 + 1 = 28; a: at least 28 balls need to be touched
Put 10 red, white and black glass balls into a box and mix them together. Only when you touch at least a few balls at a time can you touch the balls of two different colors? At least not a few balls and two pairs of balls of the same color appear? Why
(1) 11. (2) 10
Because 10 balls may be of the same color, another one will surely be of other colors. So 11 balls are needed
After three consecutive red, yellow and blue, a total of 9, such as touch must be the same as a certain color in front, so it should be 10
RELATED INFORMATIONS
- 1. There are a total of 2012 balls in the three piles. If Gao takes the same number of balls from each pile, there are still 17 balls left in the second pile, and the number of balls left in the first pile is twice that of the third pile, then the third pile is the original pile______ A small ball
- 2. The black-and-white beads are white and black, forming an equilateral triangle. When the difference between the number of black-and-white beads in the equilateral triangle is 30, how many should be arranged on each side of the triangle?
- 3. A box of beads, the first time out of the total number of 15 and 4, the second time out of the remaining 14 and 3, the third time out of the remaining 13 and 2, the fourth time out of the remaining 12 and 1, then there is still one in the box. How many original beads in the box?
- 4. The first pile has the same number of black and white pieces as the second pile. The third pile accounts for 40% of the total black pieces, and the white ones account for a few parts of the total There should be a formula
- 5. There are 64 red and black glass balls of the same size. They are arranged in the order of three red balls and one black ball. What percentage of the total number are the two kinds of glass balls?
- 6. There are 140 red and black balls in total. Take out 1 / 4 of the red ball, and then take out 7 black balls. The remaining red balls and black balls are exactly the same
- 7. There are six red, blue and yellow glass balls of the same size in the box,
- 8. All the people are here, only Li Hong is late
- 9. Li Hong is wearing a red coat and a white hat. She is very energetic?
- 10. Zhang Ming and Li Hong have collected 171 stamps. It is known that one fourth of Zhang Ming's stamp is equal to one fifth of Li Hong's? By arithmetic
- 11. How many ways to put four different balls into three different boxes?
- 12. There are 24 table tennis balls in one box 1. If two-thirds of the students are sent, how many are left? 2. If you send one sixth of the whole box to the students first, and then one third of the whole box to the students, how many will be sent to the students?
- 13. There are six red balls and six blue balls of the same size in the box. 1. If you want to find two balls of the same color, how many balls at least? 2. There must be three balls of the same color in order to touch them. How many balls should we touch at least? 3. If you want to touch the ball, there must be two colors. How many balls should you touch at least?
- 14. If four different balls are put into four red, yellow, blue and green boxes, there is exactly one empty box
- 15. In a box, there are 20 balls of red, yellow, blue, green and white. At least touch a few balls to ensure that there are two balls of each color? Come on the sooner the better Within an hour
- 16. There are 10 red, yellow and blue balls in your pocket. Close your eyes and make sure you can touch many four balls of the same color at a time. How many can you touch What's the formula
- 17. There are ten small balls in red, yellow, blue and white. Put them in a cloth bag and find five at a time. How many of them have the same color? 9, 13. What's the rule
- 18. There are 10 red, yellow, blue and white balls each, mixed in a cassette, and at least one touch out______ In order to ensure that there are six balls in the same color
- 19. There are 10 red, yellow, blue and white balls, which are mixed and put in a cassette. At least how many balls must be found at a time to ensure that there are 6 balls in the same color
- 20. If a number is a multiple of 2 and 3, it must be a multiple of 6______ ．