Guessing answers in a multiple-choice test: binomial probability of a score

1. A.
   $\frac{10}{3^5}$
2. B.
   $\frac{17}{3^5}$
3. C.
   $\frac{13}{3^5}$
4. D.
   $\frac{11}{3^5}$

Tap an option to check your answer.

1. A.
   $\frac{17}{243}$
2. B.
   $\frac{13}{243}$
3. C.
   $\frac{11}{243}$
4. D.
   $\frac{10}{243}$

Tap an option to check your answer.

1. A.
   $\dfrac{45}{4^{10}}$
2. B.
   $\dfrac{135}{4^{10}}$
3. C.
   $\dfrac{405}{4^{10}}$
4. D.
   $\dfrac{810}{4^{10}}$

Tap an option to check your answer.