>>738
修正

1/(a)+1/(b)+1/(c)+1/(d)+1/(e)+1/(f) - (1/(a+b)+1/(a+c)+1/(a+d)+1/
(a+e)+1/(a+f)+1/(b+c)+1/(b+d)+1/(b+e)+1/(b+f)+1/(c+d)+1/(c+e)+1/(c
+f)+1/(d+e)+1/(d+f)+1/(e+f)) + (1/(a+b+c)+1/(a+b+d)+1/(a+b+e)+1/(a
+b+f)+1/(a+c+d)+1/(a+c+e)+1/(a+c+f)+1/(a+d+e)+1/(a+d+f)+1/(a+e+f)
+1/(b+c+d)+1/(b+c+e)+1/(b+c+f)+1/(b+d+e)+1/(b+d+f)+1/(b+e+f)+1/(c+
d+e)+1/(c+d+f)+1/(c+e+f)+1/(d+e+f)) - (1/(a+b+c+d)+1/(a+b+c+e)+1/
(a+b+c+f)+1/(a+b+d+e)+1/(a+b+d+f)+1/(a+b+e+f)+1/(a+c+d+e)+1/(a+c+d
+f)+1/(a+c+e+f)+1/(a+d+e+f)+1/(b+c+d+e)+1/(b+c+d+f)+1/(b+c+e+f)+1/
(b+d+e+f)+1/(c+d+e+f)) + (1/(a+b+c+d+e)+1/(a+b+c+d+f)+1/(a+b+c+e+
f)+1/(a+b+d+e+f)+1/(a+c+d+e+f)+1/(b+c+d+e+f)) - (1/(a+b+c+d+e+f))

でした。