alleryA–E encode bijectively as A–E; none stays unchanged. D→A; exactly one of A→B,C→D holds. A’s code is alphabetically just after E’s; B’s code is after E’s. Code BE?
ADB
BBD
CEB
DED
Answer & Solution
Correct answer: C. EB
The only key is A→C,B→E,C→D,D→A,E→B, so BE encodes EB.
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