Thread: Prove that, for odd...

(Note that pi should be taken as meaning p sub i. I don't know how to do formatting with this, and when I try, it removes it.)

Prove that, for odd pi, we have ∑((pi-1)/2) is congruent to ((∏pi)-1)/2 mod 2.

Hint : split up the 's into two classes, according to whether they are or .