Add Random force in my scripts

hello
enter code here` I try to Add back a random force in my scripts could you help me ??

var obj: GameObject;

    var  force: float = 999999999999999;
    var nums: Transform;





function Start () {

}

function OnMouseDown () {
	  this.rigidbody.AddExplosionForce(force, obj.transform.position, 5);
	  Instantiate(nums, transform.position, transform.rotation);

}

When posting questions here, it’s best to be more specific. Because this issue is obvious from the code, it’s not a big deal, but typically “here’s code, please help” is not a question that will be answered.

rigidbody.AddForce(Random.OnUnitSphereforce, ForceMode.Impulse);*