Question

What is the second term in the binomial expansion of (2r-3s)^12

Answer 1

Answer: A. –73,728r^11s

Just took the test on edge, this is correct :)

Answer 2

(a-b)¹²=a¹²-12a¹¹b+...

Let a=2r and b=3s then the second term is -12(2r)¹¹(3s)=-73728r¹¹s.