n ' ' " '.l' ' ' 5. We denote A = {1,2, . ..,n}. The cardinal of the set of parts, TWA), is 2\". The cardinal of the set of functions f(A,{0,1}) is also 2\". We construct the function (,0 : PUD ) I(A, {0,1}) dened by 9961,15,\" - ,ik) = the sequence having Is on slots 3'1, 3'2, . . . ,2}; and Us in rest. For instance, if A = {1, 2, 3}, then 90(9) 2 (0,0,0), mm = (1,0,0), mm = (0,1,0), w({3}) = (0,0,1), 90({1'2}) : (1: 150)! 80({213}):(01 1! 1): (P({173}) : (1:0: 1), and 90({1'21 3}) 2 (111,1)- Prove that (p is a. bijective function