Question

Suppose a jar contains 20 red marbles and 10 blue marbles. If you reach in the jar and pull out 2 marbles at random at the same time, find the probability that both are red.

Answer 1

Answer:

The probability that both are red is 2/9

Step-by-step explanation:

Given the sample space

20 red marbles and

10 blue marbles

the sample size is

S= 20+10= 30

The probability that both are red if two marbles are pulled at once is

$\frac{20}{30} *\frac{10}{30} \\\\=\frac{2}{3}*\frac{1}{3} = \frac{2}{9}$