Arecent study conducted by a health statistics center found that 25% of households in a certain country had no landline service. this raises concerns about the accuracy of certain surveys, as they depend on random-digit dialing to houeholds via landlines. pick five households form this country at random. complete parts a) through c).

a) what is the probability that all five of them have a landline?
b) what is the probability that at least one of them does not have a landline?
c) what is the probability that at least one of them does have a landline?
*i know these answers, i just need to know how to get to them