Switch statement not working C# (answered)

My game creates two obstacles which can each be in one of three different positions(picked randomly). However in my game i never want them to be the same position to begin with. So using my knowledge of switch statements from the switch statement beginner tutorial i created one to change my second obstacles position to a position which was not the same as the first and was randomly decided from the other two positions. I know this sounds complex but hopefully the code will explain it, i come across what i believe are syntax errors yet the code is fine in comparison with the rules talked about in the tutorial. Below is my code and errors -

 using UnityEngine;
 using System.Collections;
 
 public class Generater2 : MonoBehaviour {
     public Rigidbody original;
     public new Vector3 startPoin;
     public Vector3 posOne;
     
     Vector3[] positionArra = new Vector3[3];
     Vector3[] positionArr = new Vector3[3];
     
     // Use this for initialization
     void Start () {
         InvokeRepeating("Spawn", 2.1f, 1f);
 
         positionArra[0] = new Vector3(0f,4f,100f);            
         positionArra[1] = new Vector3(10f,4f,100f);
         positionArra[2] = new Vector3(-10f,4f,100f);
 
         positionArr[0] = new Vector3(0f,4f,100f);            
         positionArr[1] = new Vector3(-10f,4f,100f);
     }
     
     // Update is called once per frame
     void Update () 
     {
         startPoin = positionArra[Random.Range(0,3)];
 
         GameObject plane = GameObject.Find("Plane");
         Generater playerScript = plane.GetComponent<Generater>();
         posOne = playerScript.startPoint;
 
         if (posOne == startPoin)
         {
             switch (posOne)
             {
                 case (-10f, 4f, 100f):
                     startPoin = positionArra[Random.Range(0,2)];
                     break;
 
                 case (0f, 4f, 100f):
                     startPoin = positionArra[Random.Range(1,3)];
                     break;
 
                 case (10f, 4f, 100f):
                     startPoin = positionArr[Random.Range(0,2)];
                     break;
             }
 
         }
     }
     
     
     
     void Spawn () {
         Rigidbody clone = (Rigidbody)Instantiate (original, startPoin, new Quaternion (0,0,0,0));
     }
     
 }

Assets/Scripts/Generater2.cs(36,43): error CS1026: Unexpected symbol ,', expecting )'

Assets/Scripts/Generater2.cs(40,36): error CS1525: Unexpected symbol `case'

Assets/Scripts/Generater2.cs(54,14): error CS0116: A namespace can only contain types and namespace declarations

Assets/Scripts/Generater2.cs(58,1): error CS8025: Parsing error

Assets/Scripts/Generater2.cs(44,36);error CS1525: Unexpected symbol 'case'