JEE PYQ: Binomial Theorem Question 33
Question 33 - 2020 (09 Jan Shift 1)
The coefficient of $x^4$ in the expansion of $(1 + x + x^2)^{10}$ is ____.
Show Answer
Answer: 615
Solution
Multinomial: cases $(\gamma=0,\beta=4): 210$; $(\gamma=1,\beta=2): 360$; $(\gamma=2,\beta=0): 45$. Total $= 615$.