Find the coefficient of x n in ( x 2 + x 3 + x...

Jaqueline Kirby
Answered
2022-06-25
Find the coefficient of in .
I have got stuck on this question, though I realise that I have probably got really close to an answer. This is how I approached it:
Then I have used the binomial theorem:
Therefore,
and as I work out coefficient of I arrive to:
I think my answer is incomplete and unfortunately, I don't have a solution to check it. I would really appreciate your help. Thank you