Level:
Project ID:
1003029204
Accepted:
1
Clonable:
0
Easy:
0
A class consists of \( 50 \) students including twins, Mark and Martin. For an exam students are randomly divided into two equally sized subgroups. Find the probability that Mark and Martin will be in the same subgroup. The results are rounded to two decimal places.
\( \frac{\binom{48}{23}+\binom{48}{25}}{\binom{50}{25}}=0{.}49 \)
\( \frac{\binom{48}{23}}{\binom{50}{25}}=0{.}24 \)
\( \frac{2\cdot\binom{48}{24}}{\binom{50}{25}}=0{.}51 \)
\( \frac{\binom{49}{24}}{\binom{50}{25}}=0{.}50 \)