$$ \text { The direction ratios of the vector }(\hat{\imath}+\hat{\jmath}) \times(\hat{\jmath}+\hat{k}) \text { are } $$
$$ 1,0,1 $$
$$ 1,-1,1 $$
$$ 1,1,-1 $$
$$ 0,1,0 $$
The product of three numbers in geometric progression is 8 and the sum of the product of the numbers taken in pairs is 14 . Find the numbers.
$$ 4,2,1 \text { and } 1,2,4 $$
$\frac{1}{4}, \frac{1}{2}, 1$ and $1, \frac{1}{2}, \frac{1}{4}$
$4 \sqrt{2}, \sqrt{2}, 1$ and $1, \sqrt{2}, 4 \sqrt{2}$
$-4,-2,1$ and $1,-2,-4$
$$ \int \frac{x+1}{x\left(1+x e^x\right)} d x= $$
$$ \log \left|c x e^x\left(1+x e^x\right)\right| $$
$$ \log \left|c x e^x\left(1+x e^x\right)\right| $$
$$ \log \left|\frac{c\left(1+x e^x\right)}{x e^x}\right| $$
$$ \log \left|\frac{c x e^x}{1+x e^x}\right| $$
Let $\vec{p}$ and $\vec{q}$ be the position vectors of P and Q with respect to the origin. If points R and S divide PQ internally and externally in the ratio 2:3 respectively, then $\overrightarrow{O R}$ and $\overrightarrow{O S}$ are perpendicular when
$4|\vec{p}|^2=9|\vec{q}|^2$
$9|\vec{p}|=4|\vec{q}|^2$
$9|\vec{p}|^2=4|\vec{q}|^2$
$4|\vec{p}|^2=9|\vec{q}|$
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