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Math Challenge II-A Combinatorics Week 2 Questions P2(a) and C1

 
 
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Math Challenge II-A Combinatorics Week 2 Questions P2(a) and C1
by Bryant Jin - Wednesday, 17 May 2017, 11:31 PM
 

P2(a). My solution was (30 choose 6)*(24 choose 6). I don't understand why the handout solution is (30 choose 7)*(23 choose 7)

C1. My solution is (4 choose 3)*((4 choose 2)^3)*6!. Why is the handout solution (4 choose 3)*(( 3 choose 2)^3)* 6!

 
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Re: Math Challenge II-A Combinatorics Week 2 Questions P2(a) and C1
by John Lensmire - Friday, 19 May 2017, 9:48 AM
 

Hi Bryant,

There must have been a typo in the solutions.

Your answers are both correct, and the handout has been updated on Edurila.

Thank you for letting us know.

If you have any other questions let us know!

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Re: Math Challenge II-A Combinatorics Week 2 Questions P2(a) and C1
by Bryant Jin - Sunday, 21 May 2017, 11:02 PM
 

Thanks!