Răspuns:
Explicație pas cu pas:
1/1·2=1/1-1/2
1/2·3=1/2-1/3
.......................
1/24·25=1/24-1/25
________________
∑1=1-1/25
similar a doua suma ∑2=1/25-1/50
n=√1/2·47·[1-1/25-1/25+1/50]=√1/94(1-1/50+1/50)=√1/94=
