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cate nr de 2 cifre distincte exista

Răspuns :

Toate numerele de la 10-99 fara: 11, 22, 33, 44, 55, 66, 77, 88, 99; adica 90 de numere.

Răspuns:

10,12,13,14,15,16,17,18,19,20,21,23,24,25,26,27,28,29,30,31,32,34,35,36,37,38,39,40,41.42,43,45,46,47,48,49,50,51,52,53,54,56,57,58,59,60,61,62,63,64,65,67,68,69,70,71,72,73,74,75,76,78,79,80,81,82,83,84,85,86,87,89,90,91,92,93,94,95,96,97,98. sunt 81 de nr.distincte și ele sumt cele de mai sus

distinct=diferit. ex:22 nu este distinct