There are 10 red, yellow, blue and white beads in one bag. In order to make sure that two of them have the same color, how many beads should be taken out at least?

There are 10 red, yellow, blue and white beads in one bag. In order to make sure that two of them have the same color, how many beads should be taken out at least?

4 + 1 = 5; answer: in order to make sure that two beads have the same color, at least 5 beads should be found