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 Dave Killoran
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#77960
Complete Question Explanation

This is the most difficult question of the game. The condition in the question stem creates the following block-sequence:

  • U :longline: P S R

Because the earliest R could be is 4th, from the third rule we can deduce that T must be 3rd. Thus, the PSR block has only two options: 4-6 or 5-7.

When the block is in 4-6, U must be 1st or 2nd. Because Q :longline: W, Q must also be 1st or 2nd, and W must be last. When the block is in 5-7, the remaining three unplaced variables—U, Q, and W—have several options, although from the first rule Q can never be 4th and W can never be 1st.

These are the resulting two diagrams:

  • Block in 4-6:       U/Q       Q/U ..... T ..... P ..... S ..... R ..... W
    ..... ..... ..... 1 ..... 2 ..... 3 ..... 4 ..... 5 ..... 6 ..... 7 .....



    Block in 5-7: ..... ..... .....      T ..... .....   P ..... S ..... R
    ..... ..... ..... 1 ..... 2 ..... 3 ..... 4 ..... 5 ..... 6 ..... 7 .....
    ..... ..... ..... ..... ..... ..... ..... Q


Accordingly, T can never be immediately in front of Q, and answer choice (B) is correct.
 bella243
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#77930
Could someone please so kindly show a quick way to solve question 4? My approach - trying answer choices - was rather time consuming. Aside from hypotheticals, my thinking was that T had to be placed before PSR.

Thanks so much!
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 Stephanie Turaj
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#78022
bella243 wrote:Could someone please so kindly show a quick way to solve question 4? My approach - trying answer choices - was rather time consuming. Aside from hypotheticals, my thinking was that T had to be placed before PSR.

Thanks so much!
Hi Bella!

Thanks for the post! Dave has updated this question with an official explanation above. :D Thanks!

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