Alert - correct answer should be 6.

Here`s why - There are five sets of balls and each set is of a different color. If you want to ensure that you`ve picked at least two balls of the same color, you need to look at the worst-case scenario. The worst-case scenario would be that you pick one ball, and it is of a unique color. Then you pick a second ball and it is of a second unique color. This scenario continues until you have picked one from each of the five sets. So, with five picks, you still don`t have a pair of the same color. On the sixth draw, however, you`re guaranteed to have a pair since you`ve already picked a ball from each set, so anymore picking ensures a duplicate color. Thus, the correct answer should be 6, not 1. The provided answer is not accurate.