Level:
Project ID:
2010013603
Source Problem:
Accepted:
0
Clonable:
1
Easy:
0
There are \( 28 \) students in the class, one of them is Boris. The teacher picks randomly four students to be tested. What is the probability that Boris is among them?
\( \frac{\binom{27}3}{\binom{28}4}\doteq 0.143 \)
\( \frac{\binom{27}4}{\binom{28}4}\doteq 0.857 \)
\( \frac{\binom{27}3}{\binom{28}3}\doteq 0.893 \)
\( \frac{\binom{27}{3}\binom{4}1}{\binom{28}{4}}\doteq 0.571 \)