If $\ell x = my = nz$, then $\dfrac{x^2}{yz} + \dfrac{y^2}{zx} + \dfrac{z^2}{xy}$ equals—

Question

Accepted Answer

$\dfrac{mn}{\ell^2} + \dfrac{n\ell}{m^2} + \dfrac{\ell m}{n^2}$

Answer

$\ell + m + n$

Answer

$\ell m n$

Answer

$1$

If ℓx=my=nz\ell x = my = nzℓx=my=nz, then x2yz+y2zx+z2xy\dfrac{x^2}{yz} + \dfrac{y^2}{zx} + \dfrac{z^2}{xy}yzx2​+z equals—