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Title: Poor explanations for answers.
Review: I found that the explanations given for the answers are unsatisfactory. On the tougher problems (Bin 3) too many of the explantions were to plug in the choices given and see if they work. Some explanations were unecessarily complicated.The good news is that the CD rom works in this edition but the drawback is that the CD rom has no explantions for answers.
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