"Connecting a separate communication wire between each pair of processors was impractical since a million processors would require $10^{12]$ wires." Isn't it m

"Connecting a separate communication wire between each pair of processors was impractical since a million processors would require $10^{12]$ wires." Isn't it more like sum_(n=1)^999999(1000000-n) = 499999500000 ? https://www.wolframalpha.com/input/?i=999999+%2B+999998+%2B+999997+%2B+...+%2B+1 https://www.wolframalpha.com/input/?i=999999+%2B+999998+%2B+... Since "one" wire connect in theory two processors?:)