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#26 2013-01-09 05:58:00

anonimnystefy
Real Member

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Re: probability

We could continue in your thread in Computer Math about diophantine equations.


The limit operator is just an excuse for doing something you know you can't.
“It's the subject that nobody knows anything about that we can all talk about!” ― Richard Feynman
“Taking a new step, uttering a new word, is what people fear most.” ― Fyodor Dostoyevsky, Crime and Punishment

#27 2013-01-09 06:00:14

bobbym
Administrator

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Re: probability

That is not what I meant. GF's are rather obscure and not taught. He/she will probably expect a solution in terms of ncr's.


In mathematics, you don't understand things. You just get used to them.
I have the result, but I do not yet know how to get it.
All physicists, and a good many quite respectable mathematicians are contemptuous about proof.

#28 2013-05-22 08:47:13

Batman
Guest

Re: probability

What you could do is say the kids got a, b, c, d, d (the twins each got the same) and then seek quadruples satisfiing a+b+c+2d=13 than try each value of d.
d=0: 13 candies 3 kids place dividers in ccccccccccccc (c for CANDY!) and see the number of ways we can put the 3 dividers (3 kids left) so 15 choose 2 = 105
d=1: same, 13 choose 2 = 78   
d=2: same logic, 11 choose 2 = 55
d=3: ditto I stop saying same tongue 9 choose 2 = 36
d=4: 7 choose 2 = 21
d=5: 5 choose 2 = 10
d=6: 3 choose 2 = 3
105+78+55+36+21+10+3=308
I got 308

#29 2013-05-22 09:17:38

bobbym
Administrator

Online

Re: probability

Hi;

Welcome to the forum, 308 is the correct answer.


In mathematics, you don't understand things. You just get used to them.
I have the result, but I do not yet know how to get it.
All physicists, and a good many quite respectable mathematicians are contemptuous about proof.

#30 2013-05-22 14:36:25

anonimnystefy
Real Member

Offline

Re: probability

That looks like something that would please the OP.

By the way, I just though of a twist to the puzzle to make it just a bit harder.


The limit operator is just an excuse for doing something you know you can't.
“It's the subject that nobody knows anything about that we can all talk about!” ― Richard Feynman
“Taking a new step, uttering a new word, is what people fear most.” ― Fyodor Dostoyevsky, Crime and Punishment

#31 2013-05-22 14:56:09

Agnishom
Real Member
Award: Wink Sherlock

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Re: probability

bobbym wrote:

Yes, I see that.

How about the recurrence:



with a(0)=1,a(1)=3

This is for what?


'And fun? If maths is fun, then getting a tooth extraction is fun. A viral infection is fun. Rabies shots are fun.'
'God exists because Mathematics is consistent, and the devil exists because we cannot prove it'
'Who are you to judge everything?' -Alokananda

#32 2013-05-22 18:27:01

bobbym
Administrator

Online

Re: probability

For post #1.


In mathematics, you don't understand things. You just get used to them.
I have the result, but I do not yet know how to get it.
All physicists, and a good many quite respectable mathematicians are contemptuous about proof.

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