Q. Coefficient of $x^{2}y^{3}z^{4}$ in $({ax + by + cz)}^{9}$ is
A) $1060a^{2}b^{3}c^{4}$
B) $1160a^{2}b^{3}c^{4}$
C) $1260a^{2}b^{3}c^{4}$
D) $960a^{2}b^{3}c^{4}$
Explanation
(c)
$Coefficient\ of\ x^{2}y^{3}z^{4} = \frac{9!}{2!3!4!}a^{2}b^{3}c^{4} = 1260a^{2}b^{3}c^{4}$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.