Several balls or cards drawn at once: probability by combinations

1. A.
   $\frac{1}{3}$
2. B.
   $\frac{2}{7}$
3. C.
   $\frac{1}{21}$
4. D.
   $\frac{2}{23}$

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

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1. A.
   $\dfrac{7}{221}$
2. B.
   $\dfrac{5}{221}$
3. C.
   $\dfrac{8}{221}$
4. D.
   $\dfrac{9}{221}$

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