Question

cate numere se gasesc in secventa 9,12, 15,..., 249

Answer 1

9,12,15,...,249
3*3,3*4,3*5,....,3*83
3,4,5,....,83
In concluzie sunt 81 de numere.

Answer 2

Nr termenilor: (249-9):3+1=
                        240:3+1=
                        80+1=
                         81