The disused hockey stadium metropolis East could be deployed for up to three television cameras, in the case of a live television broadcast of a hockey game. These detect low independently. For the first (central) camera is likely that they will shoot at any given time 60% for the second and third (covering a third or home. Guests) is the same probability equal to 80%. Let's calculate probability that they will shoot at any given moment what is happening on the ice surface at least one of the cameras