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Question: 12 13 12 31 32 33 a31 a32 a33 a34...

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12 13 12 31 32 33 a31 a32 a33 a34 1 42 43 Denote row i in matrix A above as vector ai and row i in matrix B as vector bi; for example, a-a a,, az, a24]. Similarly, denote column k in matrix A as vector ak and column k in matrix B as vector bk a) Does matrix C = AB exist? If no, explain why not. If yes, write it out expressing each element cik as the inner product of the relevant vectors defined above b) Does matrix D- BA exist? If no, explain why not. If yes, write it out expressing each element dik as the inner product of the relevant vectors defined above
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