Question

There are four blue marbles, an unknown number of red (r) marbles, and six yellow marbles in a bag. Which expression represents the probability of randomly selecting a blue marble, replacing it, and then randomly selecting a red marble

Answer 1

Answer:

There are a total of 4 + r + 6 marbles in the bag

The probability of a blue is  $\frac{4}{10+r}$  

The probability of a red is  $\frac{r}{10+r}$  

The probability of choosing a blue, replacing it and then a red is

$\frac{4}{10+r}$ × $\frac{r}{10+r}$  =  [tex]\frac{4r}{100+20r+ r^{2} /[tex]

Step-by-step explanation: