Which of the following is not a monomial?

The sum of the coefficients in the monomials $3{\mathrm{a}}^2\mathrm{b}$ and $-2{\mathrm{ab}}^2$ is

The sum of the numeral coefficients in the terms of $2x^{2}y-3x{y}^2+4xy$ is

The product of the numerical coefficients of terms in $-\frac{4}{3}{\mathrm{ab}}^2+\frac{1}{4}{\mathrm{bc}}^2+3{\mathrm{ca}}^2$ is

If $\mathrm{a}$ and $\mathrm{b}$ are respectively the sum and product of numerical coefficients of the terms in the expression ${\mathrm{x}}^2+{\mathrm{y}}^2+{\mathrm{z}}^2-\mathrm{xy}-\mathrm{yz}-\mathrm{zx}$, then $\mathrm{a}+2\mathrm{b}=?$

If $\mathrm{P}=3{\mathrm{x}}^3+3{\mathrm{x}}^2+3\mathrm{x}+3$ and $\mathrm{Q}=3{\mathrm{x}}^2-3\mathrm{x}+3$, then $\mathrm{P}-\mathrm{Q}=$

The sum of the values of the expression $2{\mathrm{x}}^2-2\mathrm{x}+2$ when $\mathrm{x}=-1$ and $\mathrm{x}=1$ is