If \( \overrightarrow{\mathrm{P}} \times \overrightarrow{\mathrm{Q}}=\overrightarrow{\mathrm{R}}...
If \( \overrightarrow{\mathrm{P}} \times \overrightarrow{\mathrm{Q}}=\overrightarrow{\mathrm{R}} \), then which of the following statements is not true?
(1) \( \overrightarrow{\mathrm{R}} \perp \overrightarrow{\mathrm{P}} \)
(2) \( \overrightarrow{\mathrm{R}} \perp \overrightarrow{\mathrm{Q}} \)
(3) \( \overrightarrow{\mathrm{R}} \perp(\overrightarrow{\mathrm{P}}+\overrightarrow{\mathrm{Q}}) \)
(4) \( \overrightarrow{\mathrm{R}} \perp(\overrightarrow{\mathrm{P}} \times \overrightarrow{\mathrm{Q}}) \)
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