Question 4 please

3. Measurable r.v., 2 points Let 0 = {1, 2, 3, 4} and the o-algebra G is {0, 0, (2), (1, 3, 4) } Describe all r.v. that are G-measurable. 4. Convergence in mean square, 3 points If a sequence of r.v. X, converges to X in mean square, with E[X"]