I Thought this would be a permutation question, but the answer 400 is not right. I also tried combination and that was also wrong. Is this a vector cross product question? If so how do I start it?
2026-03-25 22:06:20.1774476380
Let Σ={1,2,3,4,5,6,7,8}. How many strings of length 3 or less are there over Σ?
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