126 = (9)
(5)
126 = (9)
(4)
84 = (9)
(3)
36 = (9)
(7)
Unfamiliar notation that looks like a vector but isnt
Author
I'm trying to get my head around a certain equation (well, actually a few), but they have this notation that I initially thought was a vector with 2 elements, but when I worked through it I found that didnt make sense... Luckily in the paper I was reading it gives the parameters and the answer, but I dont get how they have got from one to the other e.g. (assume the little brackets are big ones)
that's the "choose" function, used in many fields but originating in probability. as an example, lets say you had 9 types of topping for a hot dog, and you wanted to find out how many different combinations you could make by picking 5 of those toppings, 9 choose 5 is your answer, or 126.
Mathworld explanation
Mathworld explanation
Author
Excellent! Cheers for that, you have no idea how stumped that had me. I know a little about combinatorics, but only ever seen nCk style before, never this damned ambiguous notation!
Thanks again,
Thanks again,
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