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04 Mar 2017, 07:56
Kudos
Bookmarks
D
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
5%
(low)
Question Stats:
94% (00:50) correct
6%
(01:30)
wrong
based on 109
sessions
History
Date
Time
Result
Not Attempted Yet
For any positive integer n, n! denotes the product of all the integers from 1 through n. What is the value of 3!(7 – 2)! ?
(A) 2!
(B) 3!
(C) 5!
(D) 6!
(E) 10!
(A) 2!
(B) 3!
(C) 5!
(D) 6!
(E) 10!
04 Mar 2017, 08:20
Kudos
Bookmarks
vikasp99
3!(7 – 2)!
= 6*5!
Thus, answer must be 6!
Answer must be (D)....
06 Mar 2017, 12:51
Kudos
Bookmarks
Hi vikasp99,
The answer choices to this question are sufficiently "spread out" that you can get the correct answer without having to do too much math.
We're asked for the value of 3!(7-2)!
Since we're multiplying (7-2)! = 5! by another factorial, we clearly will end up with a number that is GREATER than 5! However, 10! is SO MUCH greater than 5! that that cannot possibly be the result. There's only one answer that 'fits':
Final Answer:
GMAT assassins aren't born, they're made,
Rich
The answer choices to this question are sufficiently "spread out" that you can get the correct answer without having to do too much math.
We're asked for the value of 3!(7-2)!
Since we're multiplying (7-2)! = 5! by another factorial, we clearly will end up with a number that is GREATER than 5! However, 10! is SO MUCH greater than 5! that that cannot possibly be the result. There's only one answer that 'fits':
Final Answer:
GMAT assassins aren't born, they're made,
Rich
