MCQ
Matrix $\left[ {\begin{array}{*{20}{c}}0&{ - 4}&1\\4&0&{ - 5}\\{ - 1}&5&0\end{array}} \right]$is
- AOrthogonal
- BIdempotent
- ✓Skew- symmetric
- DSymmetric
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$(A)$: $\max \left\{\left|a_1\right|,\left|a_2\right|,\left|a_3\right|\right\} \leq|\vec{a}|$
$(B)$: $|\vec{a}| \leq 3 \max \left\{\left| a _1\right|,\left| a _2\right|,\left| a _3\right|\right\}$
(where symbols have their usual meaning in $\Delta\,ABC$ )