Complete the following proofs.
(a) A A = A. Proof: Let bij be an element of A A. If bij = 0, then aij = _____, because If bij = 1, then aij =______ because Hence bij = aij for each i, j pair.
(b) A A = A. Proof: Let bij be an element of A A. If bij = 0, then _____. If bj = 1, then _____(Explain.) Hence bj = aij for each i, j pair.
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