Algebra please help..
posted by Cheryl .
1. Find P(10, 2).
a. 90
b. 20
c. 200
d. 60
Answer: B
2. Find C(9, 3).
a. 84
b. 504
c. 210
d. 360
Answer: A
Please Answer!!

What are the meanings of P and C and what do the following two numbers mean?