Question

Ofer 15 puncte va rog ​

Answer 1

(1/1×2+1/2×3+...+1/24×25)-(1/25×26+1/26×27+...+1/49×50)=1/1-1/2+1/2-1/3+...+1/24-1/25)-

(1/25-1/26+1/26-1/27+...+1/49-1/50)=

(1-1/25)-(1/25-1/50)=1-2/25+1/50=

(50-4+1)/50=47/50

x=√(1/94)×(47/50)=√1/100=1/10