The binomial expansion Flashcards
1
Q
What does the notation n! mean?
A
n(n-1)(n-2)…1
2
Q
How many ways can n objects be arranged?
A
n!
3
Q
What does the notation ⁿCₐ mean?
A
n!/(a!(n-a)!)
4
Q
How many ways can n objects be arranged when there’s a of one type and n-a of another?
A
ⁿCₐ
5
Q
How can (a+b)ⁿ be expanded using the binomial expansion?
A
ΣⁿCᵣ*aʳbⁿ⁻ʳ, r=0 to n
