1+6+11+16+21+....+91+96 va rog

Răspuns :

1+6+11+16+21+26+31+36+41+46+51+56+61+66+71+76+81+86+91+96=970
1+6+11+16+21+26+31+36+41+46+51+56+61+66+71+76+81+86+91+96=970