If \( \mathrm{A} \) idempotent matrix and \( \mathrm{A}+\mathrm{B}=...

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If \( \mathrm{A} \) idempotent matrix and \( \mathrm{A}+\mathrm{B}=\mathrm{I} \), then \( \mathrm{B} \) is
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