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25 September, 23:36

If a 2 x 7 matrix is multiplied to a 7x5 matrix, and then the result is multiplied to a 5 x 11 matrix, what is the size of the final result

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  1. 26 September, 02:34
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    1.

    Let A be a m*n matrix, and B be a n*k matrix,

    then A * B is a matrix of size m*k,

    2.

    in the given problem:

    Multiplying a 2 x 7 matrix by a 7x5 matrix, results in a 2 x5 matrix,

    multiplying this matrix by a 5 x 11 matrix, then results in a 2*11 matrix.

    Answer: 2*11
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