Question

Pentru numărătoarea unei cărți sau folosit 402 cifre. Cate pagini are cartea

Answer 1

1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20 - 31 cifre
21,22,23,24,25,26,27,28,29,30 - 20 cifre
31,32,33,34,35,36,37,38,39,40 - 20 cifre
41,42,43,44,45,46,47,48,49,50 - 20 cifre
51,52,53,54,55,56,57,58,59,60 - 20 cifre
61,62,63,64,65,66,67,68,69,70 - 20 cifre
71,72,73,74,75,76,77,78,79,80 -20 cifre
81,82,83,84,85,86,87,88,89,90 - 20 cifre
91,92,93,94,95,96,97,98,99,100 - 21 cifre
101,102,103,104,105,106,107,108,109,110 - 30 cifre
111,112,113,114,115,116,117,118,119,120- 30 cifre
121,122,123,124,125,126,127,128,129,130 - 30 cifre
131,132,133,134,135,136,137,138,139,140 -30 cifre
141,142,143,144,145,146,147,148,149,150 - 30 cifre
151,152,153,154,155,156,157,158,159,160 - 30 cifre
161,162,163,164,165,166,167,168,169,170 -30 cifre.
31+(7×20)+21+(7×30)=31+140+21+210=171+231=402 cifre
Deci cartea are 170 de pagini
sper că te-am ajutat!