Let B ={0,1}.Bn is the set of binary strings with n bits. Define the set En to be the set of binary strings with n bits that have an even number of 1 's. Note that zero is an even number, so a string with zero 1 's (i.e., a string that is all 0 's) has an even number of 1 's. Answer the following questions to construct a bijection relationship between B9 and E10 step by step. Note: please calculate and simplify answers fully before entering into the boxes. DO NOT leave expressions in the boxes. For example, instead of answering 210, you should answer 1024 . Q2.1 2 Points Define f: B9E10. Let xB9, if the number of 1 's in x is: (even/odd) , then f(x)=x0. if the number of 1 's in x is: (even/odd) , then f(x)=x1