The answer is 3. is it true? Help me check the answer. thank you

Question

Given that σ is the part of the surface z=2-x in the first octant from y=0 to y=1. If 𝜓(x,y,z) =x²yz, F(x,y,z)=yi+zj+xk and n is the unit normal vector to the surface pointing outwards, evaluate the following surface intergals ∫∫_σ F•n dS.

Answer 1

See the video.