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To investigate the various arrangements that could be made with different names or words. In doing so, I hope to find a pattern and figure out a formula to make this more simple.

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Introduction

Maths Coursework : Emma’s Dilemma

Thursday 5th December 2002

Lena Tran

image03.png

Aim: To investigate the various arrangements that could be made with different names or words. In doing so, I hope to find a pattern and figure out a formula to make this more simple.

Investigation One:

First Arrangement:

I am going to investigate how many words can be created using the name “EMMA” :

1) EMMA

2) MEAM

3) AEMM

4) MAEM

5) MEMA

6) MAME

7) MMAE

8) MMEA

9) EAMM

10) EMAM

11) AMEM

12) AMME

I have created 12 words out from EMMA. Seeing as EMMA has two M’s in it, the outcome of different arrangements were not much, as the two M’s stop the letters from being arranged, so that the words cannot repeat.

To do this, I used the previous word I wrote and rearranged 2 of the letters.

E.g. M E M A, changing the E and A around, I have created M A M E.

Second Arrangement

This time, I will be investigating how many words can be created using the name “LUCY”. LUCY has all different letters in it, so it will be different from EMMA.

1) LUCY

2) LCYU

3) LYCU

4) LYCU

5) LCUY

6) LUYC

7) UCYL

8) UYLC

9) ULCY

10) UCLY

11) UYCL

12) ULYC

13) CULY

14) CLYU

15) CYUL

16) CUYL

17) CLUY

18) CYLU

19) YLUC

20) YUCL

21) YCLU

22) YLCU

23) YULC

24) YCUL

I have created 24 words out from LUCY. This is much more than the number of arrangements made from the name, EMMA. This is because even though they have the same amount of letters, EMMA has fewer arrangements due to the two M’s in her name.

To do this, I used a different method.

...read more.

Middle

4

24

5

120

6

720

7

5040

I have succeeded in finding an algebraic rule for this investigation. It is quicker and more efficient to find the number of arrangements.

Investigation Three:

I am now going to be investigating words with two letters in it, the same. I will be seeing if these words will have the same amount of different arrangements as the previous investigation.

First Arrangement:

I will be investigating the name “ANN

1) ANN

2) NAN

3) NNA

I was only able to create three different arrangements from the word ANN. I have noticed that there are fewer patterns in this word, than in a word with different letters.

Second Arrangement:

I will be investigating the name “LILY

1) LILY

2) LLYI

3) LYIL

4) LLYI

5) LIYL

6) LYLI

7) YLLI

8) YLIL

9) YILL

10) ILLY

11) ILYL

12) IYLL

Like the name EMMA in my first investigation, I have created 12 words using LILY. From the results in this investigation (ANN and LILY), I have noticed that the total of arrangements are half of those from my second investigation (KAT and RITA).

E.g. KAT(6) and ANN(3). 6 halved is 3. This is could be because ANN and LILY have two of the same letters, causing their arrangements to be halved.

To show this, I will compare the two sets of results.

Letters

Arrangements

3

3

4

12

Letters

Arrangements

3

6

4

24

Words with two of the same letters

         Words with all different letters

Compared to

Comparing the two tables, I have confirmed the fact that the arrangements made from words with two of the same letters are half or that made from words with all different letters. I can now make an algebraic equation to use, to find out the number of arrangements made with two of the same letters. Since we use n! To find out words with all different letters, all I need to do is put ½ in front of n! as it halves n! The final equation would be ½n!

E.g. To find out the arrangements made from a word with 5 letters (two of which are the same), I do:

5! = 120 ÷ 2 = 60

Here is a table showing what the next few arrangements would be.

Numbers of letters in the name

Arrangements made from words with all different letters

Arrangements made from words with two of the same letters

3

6

3

4

24

12

5

120

60

6

720

360

7

5040

2520

Investigation Four:

I am now going to investigate words with 3 of the same letters, and seeing how many arrangements they make. I expect that these words will make fewer arrangements than the words with two of the same letter. I will choose a 3, 4 and 5 lettered word to get enough information to figure out a rule.

First Arrangement:

Words created from the 3 lettered word “LLL

  1. LLL

        I have only been able to make one arrangement, as even if I do mix the letters around, they will all be “LLL” anyway.

Second Arrangement:

Words created from the four lettered word “ELLL

1) ELLL

2) LELL

3) LLEL

4) LLLE

I have created four words from ELLL. This is less than LUCY and LILY, which also have the same amount of letters. This is because there are fewer different letters to arrange.

Third Arrangement:

Words created from the five lettered word “LILLY

1) LILLY

2) LILYL

3) LIYLL

4) LYLLI

5) LYLIL

6) LYILL

7) LLIYL

8) LLYIL

9) LLILY

10) LLYLI

11) LLLYI

12) LLLIY

13) ILLLY

14) ILYLL

15) IYLLL

16) ILLYL

17) YILLL

18) YLILL

19) YLLIL

20) YLLLI

I have created 20 different arrangements with the word LILLY.

I will now create a table showing the results of this investigation and also the results from my second investigation, to compare the arrangements with all different letters to the arrangements with three of the same.

Numbers of letters in the name

Arrangements made from words with all different letters

Arrangements made from words with three of the same letters

3

6

1

4

24

4

5

120

20

...read more.

Conclusion

image00.pngimage00.png

   XXimage01.png

 YYYimage02.png

       2!

3!

In this example, I have the letters: XX and YYY. Since I have two of X, I will make that into 2! I have three of Y that I will make into 3! I will put them under 5! As that is how many letters there are. I now have:

5!

2!  3!

I now need to figure out the sign in between 2! And 3! At first, I tried the additions sign.

5!

=

120

=

15

2! + 3!

8

This equation is wrong. This is because there are 10 different arrangements made from XXYYY, and not 15. So, Instead of using the addition sign, I will try using the multiplication sign.

5!

=

120

=

10

2! x 3!

12

This equation is correct. It makes sense, as 2! = 2 and 3! = 6. 5! = 120

             2 x 6 = 12

             120 ÷ 12 = 10

XXYYY makes 10 different arrangements, and the formula shown above proves it.

Here are other formulas for what might be the next arrangements.

XXXYYY = 6!

6!

=

720

=

20

3! x 3!

36

XXXYYYY = 7!

7!

=

5040

=

35

3! x 4!

144

XXXXYYYY = 8!

8!

=

40320

=

70

4! x 4!

576

Here is a table displaying the information.

Letters

Arrangements

4

6

5

10

6

20

7

35

8

70

Using this information, the formula should be:

n!

X! x Y!

The letters in the formula, X and Y represent the letters there actually are in the word. So if there was six X’s in the letter, it would be 6! I am sure this is the correct formula to work out the arrangements for this particular arrangement.

This concludes my maths coursework on word arrangement. Overall, I have learnt that there are easier ways of working out how many different arrangements a word can be made out of. I have found that doing this without a formula, or a rule, is much longer than doing it with a formula. I have also learnt how to find out formulas quickly and work out if they are right or not.

Page  of image03.png

...read more.

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