A jar contained 8 balls: 6 red, 1 green and 1 blue. We randomly take a ball out of the jar. Once a ball is selected we do not put it back. We keep selecting balls until for the first time we get a red one. We count the number of times we had to draw a ball, (including the last drawing) until we actually got the red ball.

List all elements of the sample space in braces {} and separate them with a comma. Do not include spaces.