Question

Determinati(S1;S2) in urmatoarele cazuri:
a) S1= 1+2+3+......+35 si S2=1+2+3+.....+49;
b)S1= 1+2+3+.....=55 si S2= 1+2+3+.....+64.

Answer 1

Răspuns:

Aplicam Suma lui Gauss la fiecare suma:

a)

S1=35×36:2=630

S2=49×50:2=1225

b)

S1=55×56:2=1540

S2=64×65:2=2080