Question

Sock Drawer had 10 white socks and 4 black socks. List and count possible combinations:
1) of two socks, if order matters
2) of two socks, if order doesn't matter
3) of three socks, if order matters
4) of three socks, if order doesn't matter

Answer 1

if order matters, it's a permutation.
Check your text for perms/combs with duplicates.