Question

determinati din cate cifre este format nr 4812162024...196200

Answer 1

sirul de cifre care alcatuiesc nr.dat este: 4,8,12,16,......196200 ⇔ 1·4, 2·4, 3·4, ...24·4, 25·4.... 249·4, 250·4 ......2499·4, 2500·4 , ...24999·4, 25000·4 ....49050·4

4 si 8 ..........................................................au impreuna 2 cifre

de la 12=3·4 pana la24·4=96 ......................sunt 2·22=44 cifre

de la 100=25·4pana la 249·4=996................" " "3·225=675" " " 

de la 1000=250·4pana la2499·4=9996........." " "4·2250=9000

de la 10000=2500·4 -- 24999·4............... " " "5·22500=112500

...25000·4---49050·4.............. " " " 6·24049 = 144294 cifre

TOTAL : 2+44+675+9000+112500+144294 = 266515 cifre