An experiment consists of tossing 7 fair​ (not weighted)​ coins, except one of the 7 coins has a head on both sides. Compute the probability of obtaining exactly 1 head

Identify all the cases where non-probability sampling is used when attempting to study the characteristics of a large city. studies on every subject in the population divide a population in groups and obtain a sample studies with a limited amount of time demonstrate existing traits in a population studies with the nth person selected