Question

S=1+2+3+...+95 S=1+2+3+...+129

Answer 1

S=1+2+3+.....+95
S=95*96:2
S=95*48
S=4560

S=1+2+3+....+129
S=129*130:2
S=129*65
S=8385

Answer 2

S=1+2+3+.....+95
suma Gauss, porneste din 1 si nr sunt consecutive
are formula S=n(n+1):2

S=95×96:2

S=95×48

S=4560

S=1+2+3+....+129
suma Gauss, porneste din 1 si nr sunt consecutive
are formula S=n(n+1):2

S=129×130:2

S=129×65

S=8385