Hi i have a few questions i had trouble with, i need some help! here are the questions,

1) Find an equivalent_{n}C_{r }that is the sum of the following. The symmetric pattern._{44}C_{19 }+_{44}C_{20 2) }Find an equivalent_{n}C_{r }that is the sum of the following. This is the recursive pattern._{5}C_{1}+_{5}C_{2 Thanks in advance.}