Q20

[eagerlawstudent]

For some reason I cannot find why (d) is the correct answer.

This question wants to know which choice is true. Yet, I keep getting two choices along with (d) correct.

Please help .....

[bbirdwell]

Here's what we have in the very beginning:
1 3 Y 7 9
2 R 6 8 10

1 yellow on each side, across/adjacent must be different

The question says green is in 7. This means a red or yellow must be in 9, and since we already have a yellow on that side, a red must be in 9.

1 3 Y G R
2 R 6 8 10

3 can't be red or yellow, so it must be green.

1 G Y G R
2 R 6 8 10

6 can't be yellow or red, so it must be green.

1 G Y G R
2 R G 8 10

The only choice that can never be true is (D).