Question

Se considera sirul de nr. 1,4,7,10,13....Cate nr contine sirul daca ultimul termen este 91

Answer 1

daca nr cresc din 3 in 3 ca sa aflam cate nr are sirul trebuie sa scadem 91 cu 3
91-3=88 de nr sunt in sir

Answer 2

1,4,7,10,13,16,19,22,25,28,31,34,37,40,43,46,49,52,55,58,61,64,67,70,73,76,79,81,84,87,90
Are 30 numere