MCQ
જો રેખાઓ

$ \mathrm{L}_1: \overrightarrow{\mathrm{r}}=(2+\lambda) \hat{\mathrm{i}}+(1-3 \lambda) \hat{\mathrm{j}}+(3+4 \lambda) \hat{\mathrm{k}}, \lambda \in \mathbb{R} $

$ \mathrm{L}_2: \overrightarrow{\mathrm{r}}=2(1+\mu) \hat{\mathrm{i}}+3(1+\mu) \hat{\mathrm{j}}+(5+\mu) \hat{k}, \mu \in \mathbb{R}$

વચ્ચેનું ન્યૂનતમ અંતર $\frac{m}{\sqrt{n}}$ હોય, જ્યાં $\operatorname{gcd}(m, n)=1$, તો $m+n$ નું મૂલ્ય ........... છે.

  • A
    $384$
  • $387$
  • C
    $377$
  • D
    $390$

Answer

Correct option: B.
$387$
b
Shortes distance $(\mathrm{CD})=\left|\frac{\overline{\mathrm{AB}} \cdot \overrightarrow{\mathrm{p}} \times \overrightarrow{\mathrm{q}}}{|\overrightarrow{\mathrm{p}} \times \overrightarrow{\mathrm{q}}|}\right|$

$=\left|\frac{(0 \hat{i}+2 \hat{j}+2 \hat{k}) \cdot(-15 \hat{i}+7 \hat{j}+9 \hat{k})}{\sqrt{355}}\right|$

$=\frac{0+14+18}{\sqrt{355}}=\frac{32}{\sqrt{355}}$

$\therefore \mathrm{m}+\mathrm{n}=32+355=387$

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