question archive What are the permutations of the letters a, b, c, d? How many of these permutations have a preceding b? How many end with ab?
What are the permutations of the letters a, b, c, d? How many of these permutations have a preceding b? How many end with ab?
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What are the permutations of the letters a, b, c, d? How many of these permutations have a preceding b? How many end with ab?
