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DS - At a local library, a student randomly selects books from a bookshelf

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DS - At a local library, a student randomly selects books from a bookshelf

by GMATJourneyman » Sun May 28, 2023 8:50 am

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At a local library, a student randomly selects books from a bookshelf that contains novels, textbooks, and magazines. What is the probability that the first book the student picks is a textbook?

(1) The ratio of the number of novels to textbooks to magazines on the bookshelf is 2:3:4.
(2) There are 45 books on the bookshelf.

Princeton Review

The OA is A
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Source: — Data Sufficiency |
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Re: DS - At a local library, a student randomly selects books from a bookshelf

by gmatter2012 » Thu Jun 01, 2023 4:27 am

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GMATJourneyman wrote: ↑
Sun May 28, 2023 8:50 am
 At a local library, a student randomly selects books from a bookshelf that contains novels, textbooks, and magazines. What is the probability that the first book the student picks is a textbook?

(1) The ratio of the number of novels to textbooks to magazines on the bookshelf is 2:3:4.
(2) There are 45 books on the bookshelf.

Princeton Review

I think answer should be A
$$\frac{3}{9} = \frac{1}{3} $$

A is SUFF.
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