What is the bit string corresponding to the difference of

Solution:Step 1:In this problem we have to define the bit string and difference of two sets .Definition : A bit string is a sequence of zero or more bits , which is defined by 0 or 1. A bit string’s length is the number of bits in the string.If we define the universal set U and then assign a bit number to each subsets A as follows . A bit is 1, if the element corresponding to the position of the bit in the universal set is in A and otherwise 0.