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Two digit numbers generated from the set {2,3,4}.
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%I #6 Dec 04 2018 15:03:15

%S 23,24,32,34,42,43

%N Two digit numbers generated from the set {2,3,4}.

%C From a quiz.

%D K. Russell and P. Carter, Number Puzzles, W. Foulsham and Co. Ltd. (1993).

%t FromDigits/@Flatten[{#,Reverse[#]}&/@Subsets[{2,3,4},{2}],1]//Sort (* _Harvey P. Dale_, Dec 04 2018 *)

%K fini,full,nonn,base

%O 1,1

%A Herman Jamke (hermanjamke(AT)fastmail.fm), Sep 14 2006