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You can only add a 3x3 matrix to another matrix of the same size. The reuslt is a 3x3 matrix where each element is the sum of the elements in the corresponding positions in the two summand matrices.

Symbolically,

if A = {aij} and B = {bij} then A + B = {aij + bij}

where i=1,2,3 and j = 1,2,3

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Q: How do you add 3 x 3 matrix?
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