GMAT Question of the Day (Dec 21): Probability and Sentence Correction

Math (PS)

Set consists of all prime integers less than 10. If two numbers are chosen form set 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)
(B)
(C)
(D)
(E)

OA and Explanation

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

OA and Explanation