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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+r1) C (r1) 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 (1003)+401 C31===>> 136C2 Anyone please correct me if this sounds incorrect 
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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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Carol Marler, "Just My Opinion" Pluto is no longer a planet and I am no longer an actuary. Please take my opinions as nonactuarial. My latest favorite quotes, updated Apr 5, 2018. Spoiler: 
#6




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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Carol Marler, "Just My Opinion" Pluto is no longer a planet and I am no longer an actuary. Please take my opinions as nonactuarial. My latest favorite quotes, updated Apr 5, 2018. Spoiler: 
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