Question 880246
Re TY
<u>no letter can be used more than once</u>...(order Important)...does
fit the picture of 18P6 = 18!/12! = {{{18*17*16*15*14*13}}}
Common sense approach is 18 choices for 1st letter AND 17 choices for the 2nd letter etc
{{{18*17*16*15*14*13}}}
As one embarks into the topic of statistics...albeit, it is not necessary to
"re-invent the wheel" so to speak and Yes, there are procedures and formulas
that 'work' in most cases...best sometimes to look at 'why they may work'
for a particular scenario, as in this example...  As some situations do not
lend themselves to a particular robotic way of looking at things.