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4 baseball players each stand at different corners of a baseball diamo [#permalink]

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08 Nov 2009, 14:02

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4 baseball players each stand at different corners of a baseball diamond. The sides of the diamond are all of equal length. Two arrangements of baseball players are considered different only when the relative positions of the players differ. How many different ways can the baseball players arrange themselves around the diamond?

I got this right, thanks to a guess and a sketch but I am sure there is a way to solve it that is quicker.

OA = B

OE = The total number of arrangements is expressed by a factorial, 4! = 4 × 3 × 2 × 1 = 24, because there are 4 choices for the first player's corner, 3 choices for the second one, and so on. We divide this total by 4 to arrive at the number of different arrangements of players: 24 ÷ 4 = 6.

I get the factorial part, 4*3*2*1 = 24 - but can't figure out why we are dividing by 4?

Re: 4 baseball players each stand at different corners of a baseball diamo [#permalink]

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08 Nov 2009, 15:50

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ajthomas wrote:

Before I start, I hope this in the right place. I got this question from another website.

Q: 4 baseball players each stand at different corners of a baseball diamond. The sides of the diamond are all of equal length. Two arrangements of baseball players are considered different only when the relative positions of the players differ. How many different ways can the baseball players arrange themselves around the diamond?

a) 4 b) 6 c) 16 d) 24 e) 256

I got this right, thanks to a guess and a sketch but I am sure there is a way to solve it that is quicker.

OA = B

OE = The total number of arrangements is expressed by a factorial, 4! = 4 × 3 × 2 × 1 = 24, because there are 4 choices for the first player's corner, 3 choices for the second one, and so on. We divide this total by 4 to arrive at the number of different arrangements of players: 24 ÷ 4 = 6.

I get the factorial part, 4*3*2*1 = 24 - but can't figure out why we are dividing by 4?

Thanks for any input.

I don't know why there is such a solution in OE. For me it's circular permutation for 4 which is (4-1)!=3!=6.

The number of circular permutations of n different objects is (n-1)!.

Each circular permutation corresponds to n linear permutations depending on where we start. Since there are exactly n! linear permutations, there are exactly n!/n permutations. Hence, the number of circular permutations is the same as (n-1)!.

When things are arranged in places along a line with first and last place, they form a linear permutation. When things are arranged in places along a closed curve or a circle, in which any place may be regarded as the first or last place, they form a circular permutation.

The permutation in a row or along a line has a beginning and an end, but there is nothing like beginning or end or first and last in a circular permutation. In circular permutations, we consider one of the objects as fixed and the remaining objects are arranged as in linear permutation.

Thus, the number of permutations of 4 objects in a row = 4!, where as the number of circular permutations of 4 objects is (4-1)! = 3!. _________________

Re: 4 baseball players each stand at different corners of a baseball diamo [#permalink]

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30 Apr 2015, 21:21

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Re: 4 baseball players each stand at different corners of a baseball diamo [#permalink]

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07 Jul 2015, 09:40

ajthomas wrote:

4 baseball players each stand at different corners of a baseball diamond. The sides of the diamond are all of equal length. Two arrangements of baseball players are considered different only when the relative positions of the players differ. How many different ways can the baseball players arrange themselves around the diamond?

I got this right, thanks to a guess and a sketch but I am sure there is a way to solve it that is quicker.

OA = B

OE = The total number of arrangements is expressed by a factorial, 4! = 4 × 3 × 2 × 1 = 24, because there are 4 choices for the first player's corner, 3 choices for the second one, and so on. We divide this total by 4 to arrive at the number of different arrangements of players: 24 ÷ 4 = 6.

I get the factorial part, 4*3*2*1 = 24 - but can't figure out why we are dividing by 4?

Thanks for any input.

How do i recognize if it's about circular permutation? ) Are there any other good examples/theory about this topic? _________________

Saving was yesterday, heat up the gmatclub.forum's sentiment by spending KUDOS!

PS Please send me PM if I do not respond to your question within 24 hours.

Re: 4 baseball players each stand at different corners of a baseball diamo [#permalink]

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07 Jul 2015, 09:45

Expert's post

reto wrote:

ajthomas wrote:

4 baseball players each stand at different corners of a baseball diamond. The sides of the diamond are all of equal length. Two arrangements of baseball players are considered different only when the relative positions of the players differ. How many different ways can the baseball players arrange themselves around the diamond?

I got this right, thanks to a guess and a sketch but I am sure there is a way to solve it that is quicker.

OA = B

OE = The total number of arrangements is expressed by a factorial, 4! = 4 × 3 × 2 × 1 = 24, because there are 4 choices for the first player's corner, 3 choices for the second one, and so on. We divide this total by 4 to arrive at the number of different arrangements of players: 24 ÷ 4 = 6.

I get the factorial part, 4*3*2*1 = 24 - but can't figure out why we are dividing by 4?

Thanks for any input.

How do i recognize if it's about circular permutation? ) Are there any other good examples/theory about this topic?

Players make closed circle, so circular arrangement.

Re: 4 baseball players each stand at different corners of a baseball diamo [#permalink]

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12 Sep 2015, 13:55

Im not that good at this topic, Still we know all 4 spots are occupied. so the maximum combinations possible are 6. ie 4C2. 4C4, 4C3 = 4C1 are much lesser in value, we need highest value.

Re: 4 baseball players each stand at different corners of a baseball diamo [#permalink]

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24 Dec 2015, 13:31

Bunuel wrote:

ajthomas wrote:

Before I start, I hope this in the right place. I got this question from another website.

Q: 4 baseball players each stand at different corners of a baseball diamond. The sides of the diamond are all of equal length. Two arrangements of baseball players are considered different only when the relative positions of the players differ. How many different ways can the baseball players arrange themselves around the diamond?

a) 4 b) 6 c) 16 d) 24 e) 256

I got this right, thanks to a guess and a sketch but I am sure there is a way to solve it that is quicker.

OA = B

OE = The total number of arrangements is expressed by a factorial, 4! = 4 × 3 × 2 × 1 = 24, because there are 4 choices for the first player's corner, 3 choices for the second one, and so on. We divide this total by 4 to arrive at the number of different arrangements of players: 24 ÷ 4 = 6.

I get the factorial part, 4*3*2*1 = 24 - but can't figure out why we are dividing by 4?

Thanks for any input.

I don't know why there is such a solution in OE. For me it's circular permutation for 4 which is (4-1)!=3!=6.

The number of circular permutations of n different objects is (n-1)!.

Each circular permutation corresponds to n linear permutations depending on where we start. Since there are exactly n! linear permutations, there are exactly n!/n permutations. Hence, the number of circular permutations is the same as (n-1)!.

When things are arranged in places along a line with first and last place, they form a linear permutation. When things are arranged in places along a closed curve or a circle, in which any place may be regarded as the first or last place, they form a circular permutation.

The permutation in a row or along a line has a beginning and an end, but there is nothing like beginning or end or first and last in a circular permutation. In circular permutations, we consider one of the objects as fixed and the remaining objects are arranged as in linear permutation.

Thus, the number of permutations of 4 objects in a row = 4!, where as the number of circular permutations of 4 objects is (4-1)! = 3!.

HI BB,

I'm not sure if the correct answer is 3!. Here is my understanding. Feel free to correct me. However, I am still unable to arrive at correct answer!

In general, YES.. it is (n-1)! incase of circular arrangement. But, Can a diamond (with equal sides) be circular? I guess, it can be considered a square arrangement. In such cases, should not it be 2 x (n-1)! ie; 2 x (3!) = 12

4 baseball players each stand at different corners of a baseball diamo [#permalink]

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28 Dec 2015, 20:28

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Expert's post

madhusudhan237 wrote:

HI BB,

I'm not sure if the correct answer is 3!. Here is my understanding. Feel free to correct me. However, I am still unable to arrive at correct answer!

In general, YES.. it is (n-1)! incase of circular arrangement. But, Can a diamond (with equal sides) be circular? I guess, it can be considered a square arrangement. In such cases, should not it be 2 x (n-1)! ie; 2 x (3!) = 12

Responding to a pm:

It is not an international quality question and hence unsuitable for GMAT. Note that an international applicant may not know that a "baseball diamond" is supposed to be a square (the question doesn't say this). What one may assume is that it is a diamond (a kite or a rhombus). So there will be two types of corners in general and the first person can occupy the first place in 2 ways. The rest will occupy places in 3! ways and hence you might get the answer as 12. If it were specified that it is a square, then all corners would be the same and you would get the answer as 3!. _________________

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