1+2+3+4+5+...+122=
=(122×123)÷2
=7.503
1+3+5+7+...+121=
=(1+2+3+...+122)-(2+4+6..+122)
=7.503-[2×(1+2+3+...+61)]
=7.503-3.782
=3.721
7.503+3.721=11.224
rezultatul final --> 11.224
