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Birth control pills have a theoretical annual efficacy of 99.5%, but a real world efficacy of only 95%. if a college student takes the pill

Birth control pills have a theoretical annual efficacy of 99.5%, but a real world efficacy of only 95%. if a college student takes the pill for the four years she is in college, what is the probability that she will become pregnant at least once using the theoretical efficacy rate?

A. 0

B. 0.005

C. 0.020

D. 0.185

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