Maths: I need help on this question

Original post by 12115

Maire has 25 cards
Each card has a different symbol on it
Marie gives one card to Shelly and one to Pauline
In how many different ways can Marie do this?

She can give 25 different cards to Shelly
She can give 24 different cards to paulie because shelly already has one.
So the answer will be
25 x 24 = 600

If you don't understand something tell me and ill explain it

(edited 6 years ago)

Reply 2

ineedthosegrades

14

that topic is called permutations.

Reply 3

OP

Original post by Balkaran

She can give 25 different cards to Shelly
She can give 24 different cards to paulie because shelly already has one.
So the answer will be
25 x 24 = 600

If you don't understand something tell me and ill explain it

Thank you so much, so it is a little bit like a tree diagram
-12115

Reply 4

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Reply 5

TheMightyBadger

13

Original post by ineedthosegrades

that topic is called permutations.

What is the difference between combinations and permutations?

Reply 6

Original post by 12115

Thank you so much, so it is a little bit like a tree diagram
-12115

Kind of but it would be too long to write it out in that way. So you do this
And with tree diagrams you work out probability this you're not working out probability

(edited 6 years ago)

Reply 7

OP

Original post by Balkaran

Kind of but it would be too long to write it out in that way. So you do this
And with tree diagrams you work out probability this you're not working out probability

Cool thank you Mr Balkaran

-12115

Reply 8

Original post by 12115

Thank you so much, so it is a little bit like a tree diagram
-12115

It will be too long to write each individual out come so this is the method
Proof the method works
Lets say there was only 3 cards a 1,2,3
She can 1 of the 3 to shelly
and 1 of the 2 reaming to paulie
3 x 2 =6
Writing it out:
Shelly: Paulie: Remainig card:
1 2 3
1 3 2
2 1 3
2 3 1
3 1 2
3 2 1

Look there are 6 different out comes

Reply 9

Original post by 12115

Cool thank you Mr Balkaran

-12115

No problem

Reply 10

OP

Original post by Balkaran

It will be too long to write each individual out come so this is the method
Proof the method works
Lets say there was only 3 cards a 1,2,3
She can 1 of the 3 to shelly
and 1 of the 2 reaming to paulie
3 x 2 =6
Writing it out:
Shelly: Paulie: Remainig card:
1 2 3
1 3 2
2 1 3
2 3 1
3 1 2
3 2 1

Look there are 6 different out comes

Oh, I get it now, so your way is a lot easier than a tree diagram.
I genuinely though I had to draw out a tree diagram to show all the possibilities.

Thank you

BTW- r u Tamil because your name sounds asian.

Reply 11

ineedthosegrades

14

Original post by TheMightyBadger

What is the difference between combinations and permutations?

for combinations, the order of the items does not matter. So Alice,Mark,John is the same as Mark,John,Alice. However, the order in permutations does. In permutations, you try to find all the different ways in which something can be done. So if the question was: How many different ways can Alice, John and Mark be written out, we can do 3! (factorial) (shift+x^-1) to give us 6, so there are 6 ways of writing their names. However, if it asks: There are 50 sweets in a box Jack picks 2 of them, how many ways can he do this? In the question the order does not matter so we do 50x49 to give us 2450 number ways of picking 2 sweets.

(edited 6 years ago)

Reply 12

Original post by 12115

Oh, I get it now, so your way is a lot easier than a tree diagram.
I genuinely though I had to draw out a tree diagram to show all the possibilities.

Thank you

BTW- r u Tamil because your name sounds asian.

No I'm Indian me and my parents were born here in the UK but my grand parents are from India

Reply 13

OP

Original post by Balkaran

No I'm Indian me and my parents were born here in the UK but my grand parents are from India

Hi Mr Balkaran
How old are you, if you don't mind me asking?

Reply 14

Original post by 12115

Hi Mr Balkaran
How old are you, if you don't mind me asking?

I'm 15 turning 16 in 2 months.
I'm in year 11

Reply 15

OP