Q17

[sunhwa2881]

I was able to eliminate answer choices A, C, and D. However, i don't know why B can't be true. If 7, 8, and 9 are Y, G, and O, respectively, why is this wrong?

[ManhattanPrepLSAT2]

Sorry - what question are you talking about?

[sunhwa2881]

Sorry... It's Q 17. Thanks

[ManhattanPrepLSAT2]

Oh boy is this a killer problem -- one of the toughest I've ever seen.

(B) is incorrect because of the last constraint -- it's easy to read that constraint to mean "this 9 bead strand has to have all the colors" but that's not actually what it says.

What that last constraint means is that if we were to take any 8 bead part of the strand, we'd have to be able to get all 5 colors from that part. If we put y, g, and o into 7,8, and 9, then just look at the first 8 beads, we wouldn't have all 5 colors in those 8 beads.

[opulence2001]

I'm still having some trouble with this one.
The question asks if you have PY_PY_ _ _ _ then what could be true.
I know the third must be R. But the rest are a toss up for me.
why couldnt you have PYRPYGOGR? The seventh bead is O, the eigth bead is green, and the ninth bead is read (answers A, B, and D respectively). From beads 1 to 8 each colour is represented, and I see no other violations.

For this one I chose D because I figured R in the ninth position will be in front of PY (positions 1 and 2) in the bracelet.

[s0630506]

according to the 1st constraint if you have py you need r preceding and following it so 1-6 have to be PYRPYR leaving only 2 spots open for O and G, and since O cannot go next to R, G would have to go in the 7th space and O in the eighth to satisfy the final constraint of any portion of eight beads must include at least one color of each

[giladedelman]

Good explanation!

[zaidjawed]

Hi Guys,
I seem to be on the same page with sunhwa2881 here. He/she asks why B could not be true and I seem to be sharing the same train of though. After going through all the explanations posted after, I see why E is the right answer. However, why cant I have G go 8th and 0range go 9? If that were the case, B could also be true, no?

[zaidjawed]

Oh!! Now I get it! The 8 consecutive beads must contain all colours. Hence G must go in 7th. Shrewd little question!

Thanks guys