Formula for combinations without repitition

Hi all,
I need help with generating a list of all possible combinations without repetition
I have a set of 14 numbers from A1 to A14.
I need a formula to generate a list combinations (8 in a row) with above numbers without repetition (n=14, r=8). Total 3003 combinations
I also need a formula to generate another list of combinations (7 in a row) with the above same 14 numbers without repetition (n=14, r=7) Total 3432 combinations
Can someone please help me with formulation?

thanks

SG

=index($m:$y,2+m$1*mod((row()-1)/product(m$1:$y$1),1),column()-1)

Hi tim, Thanks a lot for your help