Mesh render flicker

Can someone help me with mesh render flicker ? this is what Im working on at the moment and the point is to make the 7 in " 24 / 7 " to flicker, to get that working I need a script that randomly turns of mesh render and then turns it back on agein. It would be amazing if someoen cud give me a helping hand

Take a look at this and that. Or, you can usea Random.Range to create a random sequence of on/off.

using UnityEngine;
using System.Collections;

public class Flicker : MonoBehaviour {
	public float flickerRate = .3f;
	void Start () {
		InvokeRepeating("DoFlicker", .1f, flickerRate);
	void DoFlicker()
		int state = Random.Range(0, 2);
		if(state == 1)
			transform.renderer.enabled = false;
			transform.renderer.enabled = true;

The script is made by Farooq Azam.