Card 1 of 21
(a+b)n(a+b)^n(a+b)n represents [ ] and its expansion contains n+1n+1n+1 terms.
A
0!=10!=10!=1.
B
It is generally infinite and requires a different theorem.
C
The binomial coefficient is (nr)=n!r!(n−r)!\binom{n}{r}=\frac{n!}{r!(n-r)!}(rn)=r!(n−r)!n!, with symmetry (nr)=(nn−r)\boxed{\binom{n}{r}=\binom{n}{n-r}}(rn)=(n−rn).
D
(a+b)n(a+b)^n(a+b)n represents nnn identical brackets and its expansion contains n+1n+1n+1 terms.
Card 1 of 21
1.3.1 Sequences and series Flashcards
21 flashcards on CCEA A Level Maths 1.3.1 Sequences and series: the key formulae, methods and definitions you need to recall for AS 1, AS 2, A2 1 and A2 2.