Question 16
Binomial TheoremFind the fourth term in the expansion of (3x − y)6.
- A.−540x3y3
- B.−540x4y2
- C.−27x3y3
- D.540x4y2
Show the answer and explanation
Answer: A (−540x3y3)
Explanation
The fourth term is ⁶C₃(3x)³(−y)³ = 20 × 27 × (−1)x³y³ = −540x³y³.