SOLUTION: Could someone please help me with this probability and statistics problem? Prove both algebraically and combinatorially (in terms of selections) that if n1 + n2 + n3 then (n c

Question 54260: Could someone please help me with this probability and statistics problem?
Prove both algebraically and combinatorially (in terms of selections) that
if n1 + n2 + n3 then (n choose n1) = (n choose n1) (n-n1 choose n2)
It's hard to write out the form of (n choose n1) in plain text basically
(n choose n1) equals to
( n )
(n1, n2, n3). Same for
(n-n1)
( n2 )
Thank you so much in advance to anyone who can help on this problem.
Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
Maybe it's the notation that is confusing but
your problem makes no sense to me.
Cheers,
Stan H.

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