<p><span style="font-size:20px;"><a href="https://www.gregmat.com/quizzes/quiz/gre-quant-flashcards-group-9-quiz" target="_blank">Click Here to Take the Quiz</a></span></p>
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<p><a href="https://gregmatapi.s3.amazonaws.com/media/misc/files/explanation_to_15.PNG"><span style="font-size:20px;">Solution to the final question #15</span></a></p>