Question

Quantos números naturais de dois algarismos podemos formar com 0 2 5 7 8 9 e quais?

Answer 1

93 números
0= 10,20,30,40,50,60,70,80,90
2=12,20,21,22,23,24,25,26,27,28,29,32,42,52,62,82,92
5=15,25,35,45,50,51,52,53,54,55,56,57,58,59,65,75,85,95
7=17,27,37,47,57,67,70,71,72,73,74,75,76,77,78,79,87,97
8=18,28,38,48,58,68,78,80,81,82,83,84,85,86,87,88,89,98
9=19,29,39,49,59,69,79,89,90,91,92,93,94,95,96,97,98,99