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The permutations of {a, b, c, d, e, f, g} are listed in lexicographic order. Which of the following permutations are just before and just after the permutation bacdefg?

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  1. agfedbc and bacdfge
  2. agfedbc and badcefg
  3. agfebcd and bacedgf
  4. agfedcb and bacdegf

Answer (Detailed Solution Below)

Option 4 : agfedcb and bacdegf
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Detailed Solution

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Concept:

Lexicographic order is the order in which the words appear in the dictionary

For the word before and after check starts from the left end

Application:

Set is {a, b, c, d, e, f, g}

The word before bacdefg is agfedcb

The word after bacdefg is bacdegf

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