Question

calculati suma gauss pentru 3+6+.......+300

Answer 1

S =  3 + 6 + ... + 300

S = 3(1 + 2 + ... + 100)

S = 3×100×101 : 2

S  = 15150

Answer 2

3+6+9+...+300=
3×(1+2+3+...+100)=
3×(100×101:2)=
3×(50×101)=
3×5050=15150