Boeing 737 Max had two deadly accidents recently: one is Ethiopian Airlines and the other one is Lion Air. Suppose that Boeing’s airplane engine will fail, when in flight, with probability 1 − p independently from engine to engine. Suppose that Boeing’s airplane will make a successful flight if at least 50 percent of its engines remain operative. Suppose we know Boeing 737 Max has two engines and Boeing 787 has four engines. For what values of p is a Boeing 787 is safer than Boeing 737 Max?