JEE PYQ: Binomial Theorem Question 46
Question 46 - 2019 (09 Jan Shift 2)
The coefficient of $t^4$ in the expansion of $\left(\frac{1-t^6}{1-t}\right)^3$ is:
(1) 14 (2) 15 (3) 10 (4) 12
Show Answer
Answer: (2)
Solution
Coefficient of $t^4$ in $(1-t)^{-3} = \binom{6}{2} = 15$.