Candidate given many problems: probability of failing to solve at most (or fewer than) two

1. A.
   $\frac{256\cdot49^4}{7^{18}}$
2. B.
   $\frac{1966\cdot49^4}{7^{18}}$
3. C.
   $\frac{1710\cdot49^4}{7^{18}}$
4. D.
   $\frac{1726\cdot49^4}{7^{18}}$

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1. A.
   $\dfrac{201}{5}\cdot\left(\dfrac{1}{5}\right)^{49}$
2. B.
   $\dfrac{316}{25}\cdot\left(\dfrac{4}{5}\right)^{48}$
3. C.
   $\dfrac{54}{5}\cdot\left(\dfrac{4}{5}\right)^{49}$
4. D.
   $\dfrac{164}{25}\cdot\left(\dfrac{1}{5}\right)^{48}$

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