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It usually takes about six weeks for the results of a Praxis exam to be posted on their website. Whether you pass or fail depends on the requirements set out by each state. If you do not pass, you can take the test again in one month, up to six times per year.
To do so, we will choose one of the three letters [A,I,N] which are repeated twice in the word Examination and then choose two of the remaining 7 letters. This can be done in [math]{3\choose 1}*{7\choose 2}[/math] ways. Now we have to permute these letters. We can do that in [math]\frac{4!}{2!}[/math] ways.