Without actually calculating the cubes, find the value of :

$\left(\frac{1}{2}\right)^{3}+\left(\frac{1}{3}\right)^{3}-\left(\frac{5}{6}\right)^{3}$

Write the degree of the following polynomials

$11-2 y^{2}$

For polynomial $p(x)=x^{3}-3 x^{2}+8 x+12$, $p(-1)=\ldots \ldots \ldots$

Find the value of the polynomial $x^{2}-7 x+12$ at.

$x=3$

The value of $249^{2}-248^{2}$ is