In this task, you are given a multiple-choice question about healthcare. Answer the question based on your information and classify your answers into '1', '2', '3', and '4'.

[Q]: Question: To calculate the number of different genotypes in any allelic series the formula is applied: 
 Options:  <1> (n-1) / 2. <2> n x (n + 1) / 2. <3> n x (n-1) / 2. <4> (n-1) x (n + 1) / 2. <5> (2n-1) / 2.
[A]: 2


[Q]: Question: Virgina Henderson describes the relationship of the nurse with the patient in the following structure: 
 Options:  <1> Levels: Substitution. Help. Accompaniment. <2> Roles: Strange. Person resource. Teacher. Leadership. Substitute. Advice. <3> Skills: Beginner Advanced beginner Effective. Expert. <4> Help modes: Act for another. Lead another. Support another. Provide an environment that fosters development. Teach another <5> Styles: Stimulation. Confirmation. Conservation and continuity of life. Self-image Compensation and rest.
[A]: 1


[Q]: Question: The placenta is a derivative of: 
 Options:  <1> The zona pellucida. <2> The trophoblast. <3> The ectoderm <4> The mesoderm <5> The primitive line.
[A]:
2