MCQ
If $x\,.\,a = 0,\,\,x\,.\,b = 0$ and $x\,.\,c = 0$ for some non-zero vector $x$, then the true statement is
- ✓$[a\,\,b\,\,c] = 0$
- B$[a\,\,b\,\,c] \ne 0$
- C$[a\,\,b\,\,c] = 1$
- DNone of these
In case $(ii),$ $a,\,\,b,\,\,c$ are coplanar and so $[a\,\,b\,\,c] = 0.$
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| Variate $( x )$ | $x _{1}$ | $x _{1}$ | $x _{3} \ldots \ldots x _{15}$ |
| Frequency $(f)$ | $f _{1}$ | $f _{1}$ | $f _{3} \ldots f _{15}$ |
where $0< x _{1}< x _{2}< x _{3}<\ldots .< x _{15}=10$ and
$\sum \limits_{i=1}^{15} f_{i}>0,$ the standard deviation cannot be