Question

сколько всего однозначных чисел? двузначных? Сколько всего трехзначных чисел, в записи которых нет цифры 0?

Answer 1

1,2,3,4,5,6,7,8,9,11,12,13,14,15,16,17,18,19,21,22,23,24,25,26,27,28,29,31,32,33,34,35,36,37,38,39,41,42,43,44,45,46,47,48,49,51,52,53,54,55,56,57,58,59,61,62,63,64,65,66,67,68,69,71,72,73,74,75,76,77,78,79,81,82,83,84,85,86,87,88,89,91,92,93,94,95,96,97,98,99,111,112,113,114,115,116,117,118,119,121,122,123,124,125,126,127,128,129,131,132,133,134,135,136,137,138,139,141,142,143,144,145,146,147,148,149,

Answer 2

и т,

Answer 3

150,160,170,180,190 не надо