please help me with this game theory problem. Thank you.

estion 5 Consider the following game in extensive form: (\"1- 2. 3) 3/2, 2, 1) '1' 2'" (3.y.3) 8.) Give necessary and sufficient conditions on the values of n1, n2, n3 and y such that there is a SPE whose payoffs are (3,y,3). Give this equilibrium. b) From the conditions you found in :1), choose n3