Telescoping sums of reciprocal surd terms by rationalising

1. A.
   1
2. B.
   5
3. C.
   9
4. D.
   10

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1. A.
   $\frac{1}{\sqrt{6}}$
2. B.
   $\frac{1}{2}$
3. C.
   1
4. D.
   $\frac{1}{6}$

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1. A.
   $\sqrt{2020} + 1$
2. B.
   $\sqrt{2021} + 1$
3. C.
   $\sqrt{2020} + \sqrt{2021} - 1$
4. D.
   $\sqrt{2021} - 1$

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1. A.
   17
2. B.
   14
3. C.
   11
4. D.
   10

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