“you should have this in your book and in your notes”
– Dr. OldNBald
“you should have this in your book and in your notes”
– Dr. OldNBald
“n to the arr!”
– Dr. OldNBald
“if I have n things, and put them on the table, order matters, how many permutation do I have?”
– Dr. OldNBald
::slaps someone’s desk::
“you need to wake up. Important stuff here!”
– Dr. OldNBald
“if I do this r times….”
– Dr. OldNBald
“see how this going? one less one less one less one less one less one less one less”
– Dr. OldNBald
“its my 5th pick”
– Dr. OldNBald
“n minus 4! there are n minus 4 picks!”
– Dr. OldNBald
“how many choices do I have?”
– Dr. OldNBald
“I pick 4 of them now…how many are left-in-the-bag”
– Dr. OldNBald
“there are n minus 3 left in the bag”
– Dr. OldNBald
“now, pick 3 of them, how many are left in the bag? pick 3, how many are left in the bag?”
– Dr. OldNBald
“this is where I pick 1, this is where I pick two”
– Dr. OldNBald
“you have n there…well actually I did say arr!”
– Dr. OldNBald
“….for concreteness”
– Dr. OldNBald