Question 246255
The first one is pretty simple.

20P15 = 20(amount to choose from)permutation 15(amount needed)

this is written as  {{{20!/5!}}} which translates into (after simplification)
20 * 19 * 18 * 17 * 16 * 15 * 14 * 13 * 12 * 11 * 10 * 9 * 8 * 7 * 6

= 20,274,183,401,472,000


The second one.
I have no idea, I believe the answer is already as simplified as it can get
but I really don't know, sorry.


Comment on my page if this was helpful.
Sincerely,
TheProdicalSon