There are 21 balls in a jar: 14 red, 4 blue and 3 green. If a single ball is drawn from the jar, what is the probability of that it is either blue or red?  Choose the correct choice from the following answers:
A) 1/12
B) 3/4
C) 6/9
D) 6/7
E) 3/4
Blue + Red =18   Total number of balls is  14+4+3= 
<gadget id="calculator"> 14+4+3</gadget>
<output>21</output>
21   So the answer is 18/21=6/7   Answer 6/7
<result>D</result>
There are 21 balls in a jar: 14 red, 4 blue and 3 green. If a single ball is drawn from the jar, what is the probability of that it is either blue or red?