A re-arrangement of the letters of the word "BARCELONA" is used as an access

code to a bank account. If you are guessing the code by choosing all possible

rearrangements, how likely is that to come up with the right one in one round if you

know:

a) "R" and "C" are next to each other.

b) The two "A" are separated by at least one letter

c) The word starts with "B" and ends in "A".