Abag contains 2 red ping pong balls and 3 green ping pong balls and 3 blue ping pong ball and 1 yellow pig pong ball find the probability of randomly selecting each out come

2 red ping pongs - least likely
3 green ping pongs - possible
3 blue ping pongs - possible
1 yellow ping pong - not possible

Your total number of ping pong balls is 9. This is your denominator (bottom number) because it is the total. Now just put the other numbers as your numirators(top number) 
Red: 2/9
Green: 3/9 or 1/3 simplified
Blue 3/9 or 1/3 simplified
Yellow: 1/9
Tell me if you have questions or need more help. Hope this helped you! :)