1. There are four story books and three science and technology books in the bookcase. We should ensure that we can take out two story books at a time, and at least how many books at a time? 2. There are 45 students in the class. How many exercise books can the teacher give to everyone at least to ensure that at least one person can get two or more? 3. There are three different natural numbers, and at least two numbers can be found to make their difference even. Why? 4. There are 20 children in the kindergarten, and now there are 64 pieces of chocolate candy, Does anyone get four or more balls? 5. Ten balls of three colors are packed together to ensure that they can get two balls of the same color at a time. At least how many balls should be taken at a time? 6. There are enough balls of four colors in the bag to ensure that six beads of the same color can be found. At least how many beads can be found? I have urgent need

1. There are four story books and three science and technology books in the bookcase. We should ensure that we can take out two story books at a time, and at least how many books at a time? 2. There are 45 students in the class. How many exercise books can the teacher give to everyone at least to ensure that at least one person can get two or more? 3. There are three different natural numbers, and at least two numbers can be found to make their difference even. Why? 4. There are 20 children in the kindergarten, and now there are 64 pieces of chocolate candy, Does anyone get four or more balls? 5. Ten balls of three colors are packed together to ensure that they can get two balls of the same color at a time. At least how many balls should be taken at a time? 6. There are enough balls of four colors in the bag to ensure that six beads of the same color can be found. At least how many beads can be found? I have urgent need

If five or three of them are science and technology books, another two are story books
46, one for each person, the 46th for everyone will make up two
At least two of the three numbers are odd or even, and the difference between the two numbers must be even
Yes, because if 64 is divided by 20, 3 is more than 4, and each person has 3. No matter how many points are left, at least someone has 4 yuan
Four, because if each of the three colors is one, the fourth color must be heavy
4 * 5 + 1 = 21. If you're not lucky, you can find 5 of each, and the 21st one will be enough for 6 of the same color