Permutation questions- urgent help needed

2200andbeyondXD
Wed, 23 Jan 2013 10:46:33 +0000

the code one is a permutation question because the order counts. as in if you have the letters: EFRT, arranging them as FERT is different than TREF… they produce different codes, so the order of them counts…

but the nb of ways to choose 2 hats from Red, green, and blue hats for example is a combination simply because choosing a red then green hat is the same as choosing a green then red hat…

this is what we mean when we say “order counts”

get it?