1. An ensemble of pairs of spin-2 systems is in the state 12/) = - Alt , + ) +20 where the notation |+), |+)2 = [+, +) and |-), |+)2 = [-, +) has been used. (a) Is this state entangled or non-entangled? Explain your answer. (b) You measure the z component of the spin of both particles. What are the possible results of this measurement and what is the probability of each result? (c) You measure the z component of the total spin of this system. What values can you obtain and with what probabilities