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Mathematics 8 Online
OpenStudy (anonymous):

http://www.saylor.org/site/wp-content/uploads/2011/06/MA-2.5.pdf page:13 (where it says :",where N is either |L-1| or |L+1| depending on whether L is positive or negative why |L-1|?

OpenStudy (anonymous):

well N depicts a value and |L-1|=|L+1| if left L is negative and right L is positive

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