Could anyone help me solve me the following problem please :-
Find the coefficent of x^27 in the binomial expansion of ( 3/x + x^2 )^18.
I can work my way through the initial steps but do not know how to go on from there. Thanks in advance.
Hello, aamiri!
We have: .
The terms are of the form: . .[1]
The terms we want are of the form: .
. . Then: .
Hence: .
It seems that there is only one term that contains
That term is: .
. . . . . . . .
. . . . . . . .
Edit: Ha! . . . This is rehash of tonio's solution . . . *blush*