Binomial theorem for expansion of the constant term, who can give me an example to see
This is too simple, for example, (ax-b) ^ n for constant term, the constant term is (- 1) ^ n × C (n) 1 × (2) ^ n = n × (- 1) ^ n × (b) ^ n
If (3a2-2a13) & nbsp; n expansion contains constant term, then the minimum value of positive integer n is ()
A. 4B. 5C. 6D. 8
The general term of the expansion is tr + 1 = CrN (3a2) n − R (− 2a13) r = crn3n − R · (− 2) ra2n − 53r, let 2n − 53r = 0, then n = 53r, ∵ R ∈ n *, when r = 3, the minimum value of positive integer n is 5, so the answer is 5