There are 73 red, black and yellow glass balls of the same size, which are arranged in the order of one red ball, two black balls and three yellow balls What's the number? What color should the 58th glass ball be?

There are 73 red, black and yellow glass balls of the same size, which are arranged in the order of one red ball, two black balls and three yellow balls What's the number? What color should the 58th glass ball be?

The fifty eighth is yellow