Răspuns :

Suma nr pare:
2438+2440+...+3710=
=(3710+2438)[(3710-2438):2+1]:2=
=6148*637:2=
=1 958 138

Suma nr impare:
2439+2441+...+3711=
=(3711+2439)[(3711-2439):2+1]:2=
=6150*637:2=
=1 958 775
Succes la sc