Răspuns :
N = 1×9 {1...9} + 2×90 {10...99} + 3×1 {100}
N = 1×9 + 2×90 + 3×1
N = 9 + 180 + 3
N = 192
Răspuns:
1,2,3..9 = 9 cifre
10,11,12...99 =90•2=180 cifre
100=3 cifre
9+180+3=192 de cifre in total
N = 1×9 {1...9} + 2×90 {10...99} + 3×1 {100}
N = 1×9 + 2×90 + 3×1
N = 9 + 180 + 3
N = 192
Răspuns:
1,2,3..9 = 9 cifre
10,11,12...99 =90•2=180 cifre
100=3 cifre
9+180+3=192 de cifre in total