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Question
Kavin has four cards 
List down all 3-digit numbers possible with these cards without repetition
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Solution
974, 946, 976, 964, 947, 967
794, 746, 796, 764, 749, 769
497, 476, 469, 479, 467, 496
697, 679, 674, 647, 694, 649
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