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Seven different books are to be stacked in a pile. One book
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12 Nov 2020, 10:37
12 Nov 2020, 10:37
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Question Stats:
72% (00:52) correct
27% (01:25) wrong based on 22 sessions
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Seven different books are to be stacked in a pile. One book is chosen for the bottom of the pile.
A) Quantity A is greater.
B) Quantity B is greater.
C) The two quantities are equal.
D) The relationship cannot be determined from the information given.
Source: 320 GRE Math Questions
Quantity A |
Quantity B |
The number of different orders the remaining books can be placed on the stack |
17 |
A) Quantity A is greater.
B) Quantity B is greater.
C) The two quantities are equal.
D) The relationship cannot be determined from the information given.
Source: 320 GRE Math Questions
Re: Seven different books are to be stacked in a pile. One book
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12 Nov 2020, 20:39
12 Nov 2020, 20:39
can anyone explain it?
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Joined: 10 Apr 2015
Posts: 6218
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Re: Seven different books are to be stacked in a pile. One book
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13 Nov 2020, 06:42
13 Nov 2020, 06:42
Carcass wrote:
Seven different books are to be stacked in a pile. One book is chosen for the bottom of the pile.
A) Quantity A is greater.
B) Quantity B is greater.
C) The two quantities are equal.
D) The relationship cannot be determined from the information given.
Source: 320 GRE Math Questions
Quantity A |
Quantity B |
The number of different orders the remaining books can be placed on the stack |
17 |
A) Quantity A is greater.
B) Quantity B is greater.
C) The two quantities are equal.
D) The relationship cannot be determined from the information given.
Source: 320 GRE Math Questions
Key concept: We can arrange an unique objects in n! ways
Once 1 book has been chosen for the bottom of the pile, there are 6 remaining books to be arranged.
We can arrange those 6 remaining books in 6! ways (720 ways)
Answer: A
Cheers,
Brent
