Pairs of letters in plugboard (Error correct from just last) Wish I could see my entries and edit. Seeing missing divisions by 2, factors with 10 pair cables, rest jumper blocks: 26*25/2 * 24*23/2 * 22*21/2 * ... * 10*9/2 * 8*7/2 = 26!/(6! * 2^10) = 546.999 * 10^18 ish. Reply
Wish I could see my entries and edit.
Seeing missing divisions by 2, factors with 10 pair cables, rest jumper blocks:
26*25/2 * 24*23/2 * 22*21/2 * ... * 10*9/2 * 8*7/2 = 26!/(6! * 2^10) = 546.999 * 10^18 ish.