(A) Light 2 is green.
(B) Light 2 is purple
(C) Light 3 is green
(D) Light 3 is purple
(E) Light 3 is yellow
9. There is exactly one possible color sequence of the three lights if which one of the following is true?
(A) Light 1 is purple.
(B) Light 2 is purple.
(C) Light 2 is yellow
(D) Light 3 is purple.
(E) Light 3 is yellow
10. If no green bulbs are selected, there are exactly how many possible different color sequences of the three lights?
(A) one
(B) two
(C) three
(D) four
(E) five
11. If no two lights are assigned light bulbs that are the same color as each other, then which one of the following could be true?
(A) Light I is green, and light 2 is purple.
(B) Light I is green, and light 2 is yellow.
(C) Light I is purple, and light 2 is yellow.
(D) Light I is yellow, and light 2 is green.