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15 choose 4

15!/(4! 11!)

15.14.13.12.11!
---------------
4.3.2.11!
15.14.13.12
---------------
4.3.2
15.7.13

is this permutation? or combination @amistre64 ?

combo since it doesnt suggest positions for the 4

its just a group of 4 people with no specific need for position
abc = bca in this case

i see thanks

where did you get the 15x7x13 ?

do you get it @catgirl17 ?

where did the 6 come from in step 2?

\(\Large \color{MidnightBlue}{\Rightarrow nCr = {n! \over (n - r)!*r! } }\)
Got it?

nCr can be represented as:
\(\Large \color{MidnightBlue}{ (\matrix{n \\r}) }\)

no i don't get it @lgbasallote

hmm but you get
15.14.13.12
-----------
4.3.2.1
right?

yes