Probability from random arrangements of letters, objects or people

1. A.
   $\frac{1}{5}$
2. B.
   $\frac{1}{10}$
3. C.
   $\frac{4}{5}$
4. D.
   $\frac{3}{10}$

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1. A.
   $\dfrac{13}{9!}$
2. B.
   $\dfrac{1}{210}$
3. C.
   $\dfrac{1}{35}$
4. D.
   $0$

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1. A.
   $\dfrac{5}{42}$
2. B.
   $\dfrac{1}{6}$
3. C.
   $\dfrac{5}{14}$
4. D.
   $\dfrac{1}{210}$

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