How many 4 digit numbers can you write using only the digits 2 and 5? With each digit having only 2 possibilities, the answer is 2 to the 4th power, which is 16. The 4 is because there are 4 digits. Think about the binary numbers 0000 to 1111, t â¦ here are 2 possibilities for each digit.
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CEN Practice Exam Review. A certified emergency nurse commonly treats patients while they face a life-threatening crisis. They are most likely to be involved while an illness or injury is still in a critical stage. CEN Test Study Guide with Practice Questions. They must be able to operate autonomously and reach important decisions quickly. Beyond the emergency room, they often play an important role in educating and supporting patients and their families during a critical medical situation.