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# Candidates should be familiar with the notation |r|<1 in this context watch

1. Can someone clarify whether |r|<1 just means that r is less than 1 or that r is less than 1 and more than -1? || The two lines are confusing me.
Thanks
2. The lines are absolute, meaning that if r is a negative value (e.g -1/2) then are converted to the respected positive value (e.g. 1/2). So you're right in assuming that -1 < r < 1.

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