PT 20, Section 3, Question 16 Forum

[applepiecrust]

This is the strand of beads question. The credited answer is E (yellow and purple), but I'm not sure why.

I was able to get the rest of the questions on the game correct, so I'm wondering if there's an obvious inference I'm missing here.

[applepiecrust]

Clarification, actually:
Do beads on either side of the clasp count as adjacent beads here? If that's the case, then the answer is obvious.

[rman1201]

Either side of the clasp isn't adjacent (states the string is in a single direction from the clasp).

3rd bead must be Red (2nd rule).
4th bead therefore cannot be Orange (violates 3rd rule) or Red (violates 2nd rule).

Therefore, since 4th bead CANNOT be Red, 5th and 6th cannot be Yellow and Purple, since this would require a Red bead in the 4th position.

[applepiecrust]

Oh, right. Thanks. Forgot to take the not-Red for 4th into account.