Consider the binomial expansion of where is a positive integer.
MATHEMATICS · Multi-part · A Level · Mathematics · Sequences and series · Sequences and series
Problem
Consider the binomial expansion of (a+b)n where n is a positive integer.
(i) State the expression for the general term of the expansion, clearly identifying the index used.
(ii) Using your answer from part (i), write an expression (in terms of n) for the 5th term in the expansion of (x−3)n.