How many permutations of the seven letters A, B, C, D, E, F, G have A immediately to the left of E ?
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Q18: consider all bit strings of length 12.
-How
Q19: Find the number of words of length
Q20: suppose that a "word" is any string
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Q22: How many 8-element DNA sequences contain exactly
Q24: nine people (Ann, Ben, Cal, Dot, Ed,
Q25: How many truth tables are possible for
Q26: let A be the set of all
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Q28: How many permutations of the seven letters
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