Independent events: probability that exactly one or at least one happens

1. A.
   $\frac{1}{7}$
2. B.
   $\frac{1}{9}$
3. C.
   $\frac{1}{4}$
4. D.
   $\frac{1}{3}$

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1. A.
   $\frac{155}{315}$
2. B.
   $\frac{64}{315}$
3. C.
   $\frac{251}{315}$
4. D.
   $\frac{32}{315}$

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1. A.
   $\frac{7}{12}$
2. B.
   $\frac{1}{4}$
3. C.
   $\frac{1}{12}$
4. D.
   $\frac{5}{12}$

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