Probability of Drawing Red or Yellow Marble

In a jar, there are 3 red marbles, 5 blue marbles, and 2 yellow marbles. If a marble is drawn randomly from the jar, what is the probability that the marble drawn is either red or yellow?

To solve this problem, first determine the total number of marbles in the jar. The total number of marbles can be calculated as:

$$ ext{Total Marbles} = ext{Red} + ext{Blue} + ext{Yellow}$$

Next, find the number of favorable outcomes, which is the sum of the number of red marbles and yellow marbles.

Finally, use the probability formula:

$$P( ext{Event}) =\frac{ ext{Number of Favorable Outcomes}}{ ext{Total Outcomes}}$$