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Question

What is the order of the product [xyz]ahghbfgfcxyz ?

A
3×1
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B
1×1
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C
1×3
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D
3×3
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Solution

The correct option is B 1×1
If two matrix of order x×m and m×n are multiplied then the order of resultant matrix is x×n.

Now in the given equation going from left, matrices of order 1×3 and 3×3 are multiplied. So, the order of resultant matrix is 1×3
And now this is multiplied by matrix of order 3×1. This will give resultant matrix of order 1×1
Hence, B is correct.

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