Question

de cate ori se foloseste fiecare dintre cifrele 1,4,7 pentru a scrie nr nat de la 0la180

Answer 1

1,4,7,10,11,14,17,21,24,27,31,34,37,40,41,44,47,51,54,57,61,64,67,70,71,74,77,81,84,87,91,94,97,100,101,104,107,111,110,114,117,120,124,127,130,131,134,137,140,141,144,147,150,151,154,157,160,161,164,167,170,171,174,177,180.
Nr. 1,4,7 se folosesc de 119 ori