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OpenStudy (anonymous):
how many different three letter variations can be formed from the letters in the word Mathematics if repetitions are not allowed.
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OpenStudy (anonymous):
It's either a combination or a permutation If it was a permutation it would be 99. But if it's a combination then it would be 165
OpenStudy (anonymous):
@jazy I don't think your answer is correct.
OpenStudy (anonymous):
990* I meant for the first answer and ok.
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