## Answers

#### Explanation:

The probability is approximately 39.5%.

#### Explanation:

Quick way to visualize this kind of probability question:

Suppose we have a bag of

#n_1# out of#N_1# red marbles

#n_2# out of#N_2# yellow marbles

...

#n_k# out of#N_k# purple marbles

where the sum of all the

Then the probability is equal to:

#[((N_1),(n_1))((N_2),(n_2))...((N_k),(n_k))]/(((N),(n)))#

For this question, the formula becomes:

#[((15),(1))((5),(1))]/[((20),(2))]#

which is equal to

#[" "15 xx 5" "]/[(20xx19)/(2xx1)]=75/190=15/38~~39.5%#