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Jan
15
awarded  Custodian
Jan
15
reviewed Edit General counting problem. Not sure how to proceed.
Jan
15
revised General counting problem. Not sure how to proceed.
corrected spelling
Jan
15
asked General counting problem. Not sure how to proceed.
Jan
13
revised I've come up with two solutions to this problem, and I don't know which is correct.
added 31 characters in body
Jan
12
revised I can't figure out this combinatorics problem… Or at least why my solution doesn't work.
added 2 characters in body
Jan
12
accepted I've come up with two solutions to this problem, and I don't know which is correct.
Jan
12
comment I've come up with two solutions to this problem, and I don't know which is correct.
Bah! How on earth did I miss that. Thanks.
Jan
12
asked I've come up with two solutions to this problem, and I don't know which is correct.
Jan
12
comment How to approach this problem of combinatorics
Nevermind! I was thinking for the general case.
Jan
12
comment How to approach this problem of combinatorics
Shouldn't it be 144? I believe you're missing a 2.
Jan
12
accepted How to approach this problem of combinatorics
Jan
11
comment How to approach this problem of combinatorics
So I shouldn't even be caring about what the actual products are? If I'm reading what you wrote correctly, this is almost like how many combinations I can make of 1 apple, 2 oranges, 2 pears, 1 kiwi, and 3 mangoes?
Jan
11
asked How to approach this problem of combinatorics
Jan
6
accepted Proof involving Stirling numbers of the second kind
Jan
6
awarded  Commentator
Jan
6
comment Proof involving Stirling numbers of the second kind
@BrianM.Scott Maybe it's assumed for all positive integers greater than equal to $k$?
Jan
5
comment Proof involving Stirling numbers of the second kind
@BrianM.Scott Yeah, I'm looking at it right now and it says, in italics, all positive integers x.
Jan
5
asked Proof involving Stirling numbers of the second kind
Jan
3
comment prove that $\text{rank}(AB)\ge\text{rank}(A)+\text{rank}(B)-n.$
Have you tried working out an example? Try a few by hand and see if you can generalize it. Or you can try showing it by contradiction; though I always feel direct proofs are much more clear.