A woman has seven cookies - four chocolate chip and three oatmeal. She gives one cookie to each of her six children: - The Beat The GMAT Forum

A woman has seven cookies - four chocolate chip and three oatmeal. She gives one cookie to each of her six children:

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BTGmoderatorDC: Moderator; Posts: 7187; Joined: Thu Sep 07, 2017 4:43 pmFollowed by: 23 members

by BTGmoderatorDC » Sun Nov 07, 2021 5:45 am

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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

OA D

Source: Manhattan Prep

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Source: Beat The GMAT — Problem Solving | Sun Nov 07, 2021 5:45 am

regor60: Master | Next Rank: 500 Posts; Posts: 416; Joined: Thu Oct 15, 2009 11:52 am; Thanked: 27 times

Re: A woman has seven cookies - four chocolate chip and three oatmeal. She gives one cookie to each of her six children:

by regor60 » Sun Nov 07, 2021 6:37 am

Distributing 6 cookies can be done in the following ways:
3 chocolate, 3 oatmeal
4 chocolate, 2 oatmeal

Pairing Deborah and Kim (D and K) together, let's examine each way above:

D&K can each have a chocolate cookie, in which case there are 4 choices of children for the remaining chocolate cookie. The remaining children get oatmeal.
4 ways

Same logic holds if D&K get oatmeal cookies instead:
4 ways

Now let's examine the 4 chocolate/2 oatmeal scenario:

D&K get chocolate cookies. Two children can be selected from the remaining 4 to receive the other chocolate cookies as follows;
4!/2!2! = 6 ways. The other 2 children get oatmeal.

D&K get oatmeal cookies. The other children get chocolate. 1 way

Total ways:15,D

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