The example states that, "Each rock classic is immediately preceded on the CD by a new composition." I understand why the diagram NR with a block around it is incorrect. However, it says that the correct diagram is R >NR with a block around NR, but I thought the answer would be R >N. I do not understand why it has to be NR with a block around it.
I would really like it if someone could clear this up. Thank You.
pg. 47 false blocks
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Hey nygiants10,
You are correct in pointing out that we can't simply diagram the rule with an "NR" block (you can have multiple N's in a row). That said, the rule requires that every R be immediately preceded by a N. Thus, if you see an R, then you must have an "NR" block: R NR The rule is inherently conditional in nature, because it is only enacted if you have R. Essentially, the rule forbids you from having multiple R's in a row (an inference you can diagram with an "RR" NotBlock). However, it leaves open the possibility that you have multiple "NN" in a row. We can also infer that R cannot be first, and therefore N must be first (assuming a dualvalue system). Finally, the reason why we wouldn't represent this rule as R N is that a rock classic does not simply require a new composition (which is what that rule representation would suggest). Rather, a rock classic requires a new composition to immediately precede the rock classic. Since the necessary condition is inherently linear in nature, it needs to be represented with a block. Hope this helps! Nikki Siclunov
PowerScore Test Preparation
Thank you for your explanation. It really helped.
How come its not written as N.....NR? I'm sure the answer if very simple, but I just don't see it.
The arrow indicates a conditional relationship. The block is to illustrate something that must occur. If you have R, it must be proceeded by N. That is why the correct diagram is N>NR (with a block). Hope this helps. Shannon
Apologies I should have written this question a little more clearer.
Why wouldn't we write the rule out as N>NR? In the answer above it's written as R>NR. Thank you!
Hi, T9909,
It's written as R [NR] because R is what triggers the block. Let's review the clue:
composition. What do we know if a new composition (N) is placed in space 3? Do we know that a rock classic (R) is placed in space 4? Not necessarily! We know that each R must be preceded by an N, but not vice versa. We don't know that there must be an R after every N. If we have a R, then we know we have [NR] (R [NR]). If we have an N, then we don't know for sure! That's why it's not written as N [NR]. This is incorrect. We do not know this for sure. I hope this helps!
Thank you so much!! Very helpful!
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