There are 20 beads of 5 different colors in the bag. To ensure that 4 beads of the same color are taken out, at least () beads should be taken out Will anyone

There are 20 beads of 5 different colors in the bag. To ensure that 4 beads of the same color are taken out, at least () beads should be taken out Will anyone

If there are at least 3 beads of the same color in 11 beads, at least (16) beads should be taken out to ensure that 4 beads of the same color are taken out