Question Detail
Question
Find the coefficient of x^4 in the binomial expansion of (1 - 2x)^7
Correct Answer
Option C is the correct answer.
Detailed Explanation
The general term is C(7, r)(-2x)^r. For x^4, r = 4: C(7,4)(-2)^4 = 35 × 16 = 560.
Hint
Use C(n, r)(ax)^r and pick r = 4.