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A woman has seven cookies

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A woman has seven cookies [#permalink] New post 08 Jun 2019, 05:33
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Question Stats:

100% (02:24) correct 0% (00:00) wrong based on 1 sessions
A woman has seven cookies - four chocolate chip and three oatmeal. She gives one cookie to each of her six children: Nicole, Ronit, Kim, Deborah, Mark, and Terrance. If Deborah will only eat the kind of cookie that Kim eats, in how many different ways can the cookies be distributed?

(A) 5040
(B) 50
(C) 25
(D) 15
(E) 12
[Reveal] Spoiler: OA
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Re: A woman has seven cookies [#permalink] New post 09 Jun 2019, 11:55
Expert's post
We have to distribute 7 cookies between 6 kids and give 7th leftover cookie for charity, so distribute 7 cookies between 7 entities: Deborah, Kim, 1, 2, 3, 4, 5.

If Deborah and Kim get chocolate cookies then there will be 2 chocolate and 3 oatmeal cookies to distribute between 5: 5!/(2!3!) = 10 (assign 5 cookies out of which 2 chocolate and 3 oatmeal cookies are identical to 5 people);

If Deborah and Kim get oatmeal cookies then there will be 4 chocolate and 1 oatmeal cookie to distribute between 5: 5!/(4!1!) = 5;

10 + 5 = 15.
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Re: A woman has seven cookies   [#permalink] 09 Jun 2019, 11:55
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A woman has seven cookies

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