MCQ
The distance of point $(1,2,3)$ from $x$-axis is :
- A$\sqrt{5}$
- B$\sqrt{10}$
- ✓$\sqrt{13}$
- D$1$
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$\frac{1}{{1 + \sqrt 2 }} + \frac{1}{{\sqrt 2 + \sqrt 3 }} + \frac{1}{{\sqrt 3 + \sqrt 4 }} + .....$ upto $15$ terms is