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Math Help - matrix multiplication

  1. #1
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    Post matrix multiplication

    Hi, im revising for my foundations of computer science exam, looking through passed papers, and ive come across a question thats giveing me troubles.

    Matrices A, B and C have sizes 2 x a, b x 3 and 3 x c respectivly. Find the conditions on a, b, c under which:

    i. The matric A . B . C exists and has the size 2 x 1

    to get the resulting matrix to be 2 x 1, c would have to be equal to 1 right? im just not sure what to set a and b to to get a matrix i can multiply in to 3 x 1.

    i hope that makes sence, thanks for you help!
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  2. #2
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    c=1, correct.
    What happens if a=b?
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  3. #3
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    yeah, i guess thats right. would you advise me to find some numbers that work in this situation, or just simply state that a = b?
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  4. #4
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    Quote Originally Posted by Cubed2D View Post
    yeah, i guess thats right. would you advise me to find some numbers that work in this situation, or just simply state that a = b?
    Any positive integer works for a.
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  5. #5
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    ahh ok, that all makes sence now, thanks for you help!
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