Assertion (A) : 2024x²yz is not a trinomial.

Reason (R) : For combining polynomials, the like terms of the given polynomials are combined together.

1. Both A and R are correct, and R is the correct explanation for A.

2. Both A and R are correct, and R is not the correct explanation for A.

3. A is true, but R is false.

4. A is false, but R is true.

In each polynomial, given below, separate the like terms:

y²z³, xy²z³, - 5x²yz, - 4y²z³, - 8xz³y², 3x²yz and 2z³y²

The sides of a triangle are x² - 3xy + 8, 4x² + 5xy - 3 and 6 - 3x² + 4xy. Find its perimeter.