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  #1  
Old 06-07-2017, 02:40 PM
1timothy124 1timothy124 is offline
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Default Probability:Example Help!!

Question: A town has 50 different small hours and 20 different big houses. I have 100 flyers to put in their mailboxes.
A. In how many different ways can I do it?
B. In how many different ways can I do it if every small house needs to get at least one and every big house at least two flyers?


A. I think that the solution would 100C50*20, but Im not sure if I did this or understood this part correctly.

B.For this problem Im thinking of using the multinomial formula (n+r-1) C (r-1) Because since 100 flyers need to be put in the mail boxes I assume that after the small house and big house get the one and two flyers respectively. Then whatever would be left would be distributed among the houses.. So i believer its (100-3)+40-1 C3-1===>> 136C2


Anyone please correct me if this sounds incorrect
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  #2  
Old 06-07-2017, 03:03 PM
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Quote:
Originally Posted by 1timothy124 View Post
Question: A town has 50 different small hours and 20 different big houses. I have 100 flyers to put in their mailboxes.
A. In how many different ways can I do it?
B. In how many different ways can I do it if every small house needs to get at least one and every big house at least two flyers?


A. I think that the solution would 100C50*20, but Im not sure if I did this or understood this part correctly.

B.For this problem Im thinking of using the multinomial formula (n+r-1) C (r-1) Because since 100 flyers need to be put in the mail boxes I assume that after the small house and big house get the one and two flyers respectively. Then whatever would be left would be distributed among the houses.. So i believer its (100-3)+40-1 C3-1===>> 136C2


Anyone please correct me if this sounds incorrect
what's the exchange rate between small hours and regular hours?
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  #3  
Old 06-07-2017, 03:07 PM
1timothy124 1timothy124 is offline
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There is no exchange rate to this problem..
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Old 06-07-2017, 03:08 PM
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Why are you asking the AO to do your homework? And why didn't you post this in the Exam section - P for probability.

By the way, you (1tim) who started the thread can move it yourself. Click on thread tools then use "move or copy thread."
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Old 06-07-2017, 03:11 PM
1timothy124 1timothy124 is offline
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thanks@JMO
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Old 06-07-2017, 03:49 PM
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Need a bit of clarification for problem A . . . what exactly is being asked?

For example, are the small houses individually identifiable? Or are they all homogenous?

For example, is the problem asking for the number of ways to sequence:

s_i (i between 1 and 50) with B_j (j between 1 and 20) so that s_1 s_2 is different from s_2 s_1

OR

just sequencing s and B (per above, s_1 s_2 is the same as s_2 s_1)
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  #7  
Old 06-07-2017, 04:07 PM
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Quote:
Originally Posted by Vorian Atreides View Post
Need a bit of clarification for problem A . . . what exactly is being asked?

For example, are the small houses individually identifiable? Or are they all homogenous?

For example, is the problem asking for the number of ways to sequence:

s_i (i between 1 and 50) with B_j (j between 1 and 20) so that s_1 s_2 is different from s_2 s_1

OR

just sequencing s and B (per above, s_1 s_2 is the same as s_2 s_1)
Also, are the flyers identical? Then the order doesn't seem to matter.
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Originally Posted by rekrap View Post
JMO is right
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Originally Posted by campbell View Post
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Originally Posted by Westley View Post
And def agree w/ JMO.
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Originally Posted by MG View Post
This. And everything else JMO wrote.
And this all purpose permanent quote:
Quote:
Originally Posted by Dr T Non-Fan View Post
Yup, it is always someone else's fault.
MORE:
Quote:
Originally Posted by Bro View Post
I recommend you get perspective.
Quote:
Originally Posted by Enough Exams Already View Post
Dude, you can't fail a personality test. It just isn't that kind of test.
Quote:
Originally Posted by Locrian View Post
I'm disappointed I don't get to do both.
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  #8  
Old 06-07-2017, 04:36 PM
1timothy124 1timothy124 is offline
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Yeah the flyers are identical and I assume that the order does not matter
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