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In how many ways can the digits from 0 to 5 be arranged three at a time?
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The terms "arranged" and "three at a time" are not compatible in this context.
They express two opposite conceptions.
The term "arranged" relates to permutations where ordering is important.
The terms "three at a time" relates to combinations where ordering is not important.
So, look into your source and reproduce the condition word-by-word.
