There are 7 red, 8 green, and 6 blue marbles

in bag. Kate is going to select one marble at

random. What is the probability that she will

select a green or blue marble?

14/21

Step-by-step explanation:

Total marbles = 7+8+6 = 21

7 Red

8 Green

6 Blue

Probability of choosing Red = 7/21

Probability of choosing Green = 8/21

Probability of choosing Blue = 6/21

Probability of choosing Green or Blue = 8/21 + 6/21 = 14/21

(8+6) / (7+8+6)

=14/21

=0.67

=67%