Explanation for Pg 543 question 2 of blue book. Thanks.

Read up on symbol functions here.

If *k** = *k*(*k* – 1) for all *k* integers *k*, then 5* = 5(5 – 1) = 5(4) = 20.

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Explanation for Pg 543 question 2 of blue book. Thanks.

Read up on symbol functions here.

If *k** = *k*(*k* – 1) for all *k* integers *k*, then 5* = 5(5 – 1) = 5(4) = 20.