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How many ways can I select 4 kittens from litter of 9?

 
 
Reply Sat 20 Jan, 2018 10:35 am
I'm taking a free online statistics and probability class from MIT. There's no professor to answer questions so I'm hoping you can help. Based on the reading, I believed the answer is 9!/4! or 9*8*7*6/4*3*2*1=126. For some reason, the MIT website calculator says this answer is wrong. What am I doing wrong? Also, I'm new here and would like to post this to the statistics forum, but I'm not certain if that is going to happen or not.
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engineer
 
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Reply Sat 20 Jan, 2018 11:30 am
@ronaldcram,
It's 9!/4!/5! which is 9*8*7*6/4*3*2*1=126. When you wrote 9!/4!, you left out part.
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ronaldcram
 
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Reply Sat 20 Jan, 2018 11:32 am
@ronaldcram,
I figured out the problem. 126 is correct, but I entered the formula rather than the answer. Thank you, Engineer.
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