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Question
What is the result of multiplication by \[1\] for a matrix \[A\]?
Options
\[1\cdot A=-A\]
\[1\cdot A=O\]
\[1\cdot A=2A\]
\[1\cdot A=A\]
MCQ
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Solution
The scalar \[1\] leaves every entry of \[A\] unchanged. Thus, multiplication by \[1\] gives \[1\cdot A=A\].
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