GMAT Question of the Day (Dec 30): Probability and Sentence Correction

Math (PS)

Set $S$ consists of all prime integers less than 10. If two numbers are chosen form set $S$ at random, what is the probability that the product of these numbers will be greater than the product of the numbers which were not chosen?

(A) $\frac{1}{3}$
(B) $\frac{2}{3}$
(C) $\frac{1}{2}$
(D) $\frac{7}{10}$
(E) $\frac{4}{5}$

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Verbal (SC)

The sudden outbreak of a devastating disease that has not been reported before and which is unknown in cause is a rarity in modern medicine.

A) which is unknown in cause
B) whose cause is unknown
C) is unknown as to its cause
D) with a cause that is unknown
E) unknown in cause

Answers to the questions: C, B
For explanations please see these threads: math and verbal

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GMAT Question of the Day (Dec 30): Probability and Sentence Correction

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