Practice By Tag: Newton's Binomial Theorem

Question: 2015 Winter Final - 4

1 . What is the coefficient of $x^{4}y^{11}$ in the expansion of $(2x - 7y)^{15}$?

(a)

$- {15 \choose 11} \cdot 2^4 \cdot 7^{11}$

(b)

${15 \choose 11} \cdot 2^{11} \cdot 7^4$

(c)

$- {15 \choose 11} \cdot 2^{11} \cdot 7^4$

(d)

${15 \choose 11} \cdot 2^4 \cdot 7^{11}$