Question

Calculati urmatoarele sume: 2+3+4+...+50 cu suma lui Gauss

Answer 1

50x51:2=m m-1=2+3+.......+50 m-1=1274

Answer 2

2+3+4+....+50=
=(1+2+3+....+50)-1=
=50*51:2-1=
=25*51-1=
=1275-1=1274