It would be best that you go through the GMAT practice test questions in the Study Guide first and then look at the videos for the questions that you might need help in.
Questions 217-220, pg. 182
Questions 221-225, pgs. 182-183
Questions 226, pg. 183
Questions 227-231, pgs. 183-184
Questions 232-236, pgs. 184-185
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