Q. If $a,b,c$ are distinct positive real number and $a^{2} + b^{2} + c^{2} = 1$, then $3\left( a^{2}b^{2}c^{2} \right)^{\frac{1}{3}}$ is

A) Less than 1
B) Equal to 1
C) Greater than 1
D) Any real number
Explanation

(a)
Using AM$>$GM [$\therefore a,b\ and\ c\ are\ distinct$]
$\therefore\frac{a^{2} + b^{2} + c^{2}}{3} > \left( a^{2}b^{2}c^{2} \right)^{1/3}\$
$\Rightarrow \ \ 3\left( a^{2}b^{2}c^{2} \right)^{\frac{1}{3}}\ \ \ \ \ \ \lbrack\therefore a^{2} + b^{2} + c^{2} = 1\ given\rbrack$

Dr. Abubacker
Reviewed by Dr. Abubacker

Physics Educator & NEET/JEE Specialist

Ph.D. in Physics with 19+ years of teaching experience.