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(MON 1) Find the number of five-digit numbers with the following properties: there are two pairs of digits such that digits from each pair are equal and are next to each other, digits from different pairs are different, and the remaining digit (which does not belong to any of the pairs) is different from the other digits.

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#NaslovOznakeRj.KvalitetaTežina
1399IMO Shortlist 1969 problem 690
1396IMO Shortlist 1969 problem 660
1394IMO Shortlist 1969 problem 640
1391IMO Shortlist 1969 problem 610
1386IMO Shortlist 1969 problem 560
1383IMO Shortlist 1969 problem 530