## Physics for Scientists and Engineers by Serway/Jewett

The problems in this book come with the (problem) numbers in different colours, some of the numbers in boxes, etc. Anyone know why this kind of different legend is used for the numbers?
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 Its written on the first page of each chapter with problems. The color code is: black for straightforward, blue for intermediate and pink for challenging.
 Sorry I hadn't noticed. Thanks for that.

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