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Now that you’ve gotten a little more confident, we’re going to give you the oppo
Now that you’ve gotten a little more confident, we’re going to give you the oppo
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2025-02-27
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问题
Now that you’ve gotten a little more confident, we’re going to give you the opportunity to practice "without the training wheels." When you want to check your work, you can turn to the solutions at the end. If you aren’t familiar with some of the mathematical concepts, make a note to pay particular attention to that chapter in this book; this practice set covers a wide range of topics tested on the GMAT.
On all data sufficiency problems, the answer choices are the same (as you’ve learned). We’ve put them here for your reference.
A. Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient.
B. Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient.
C. BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient.
D. EACH statement ALONE is sufficient.
E. Statements (1) and (2) TOGETHER are NOT sufficient. [br] A shelf contains only books of poetry, short stories, and non-fiction. If Jana draws a book randomly off the shelf, what is the probability that the book will be non-fiction?
(1) There are 15 books on the shelf.
(2) There are 4 books of poetry and 5 books of short stories on the shelf.
选项
答案
C
解析
Statement (1) doesn’t tell us anything about the breakdown of the different types of books, so we don’t know how likely Jana is to draw a non-fiction book. Eliminate A and D.
Statement (2) alone doesn’t tell us anything about the number of non-fiction books. So we can eliminate B.
Putting the statements together, we can tell that there are 6 non-fiction books on the shelf by subtracting 4 and 5 from 15. Therefore, Jana has a 6/15 or 2/5 probability drawing a of non-fiction book at random, and our answer is C.
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