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Algebra of Limits

If I be a u...

Question

If $I$ be a unit matrix then which is true ?

I^{2} = 1

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| I | = 0

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| I | = 2

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None

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Solution

The correct option is A $I^{2} = 1$
$⎡ ⎢ ⎣ \begin{matrix} 1 & 0 & 0 0 & 1 & 0 0 & 0 & 1 \end{matrix} ⎤ ⎥ ⎦ | I | = 1 | I |^{2} = (I)^{2} = 1$

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