This says any consecutive 8 beads must contain all colors. Why can't beads 2 though 9 contain each color and satisfy the rule? If 2-9 can satisfy the rule than the 8th bead can be green and the question would have more than one right answer.

Hi @kjmc11, Thanks for the question! This one is a tricky one that trips people up, but basically, “any” consecutive 8 beads must contain all colors is not the same as “at least one set of” consecutive 8 beads must contain all colors. “Any” consecutive 8 beads means that if you have a 10-bead strand, beads 1-8 contain all colors, 2-9 contain all colors, and 3-10 contain all colors. Take a look at your examples: your beads 1-8 are both missing orange. If beads 1-8 don’t have a color, is it true that “any” consecutive 8 beads have all colors? No, and beads 1-8 are an example of consecutive beads that don’t have all colors. So it’s a bit tricky, but makes sense when you think about what the word “any” means, versus a word like “at least one, 8 consecutive beads have all the colors.” Hope this helps! Feel free to ask any other questions that you might have.

exactly what i was thinking, thank you for asking and thank you for clarifying

Glad I was able to help!