Set A: {1, 3, 6, 9, 12, 15,18}
If three numbers are randomly selected from set A without replacement, what is the probability that the sum of the three numbers is divisible by 3? Choose the correct choice from the following options:
A) 3/14
B) 2/7
C) 9/14
D) 4/7
E) 11/14
probability : 6/7*5/6*4/5=4/7.   Ans 4/7
<result>D</result>
Set A: {1, 3, 6, 9, 12, 15,18}
If three numbers are randomly selected from set A without replacement, what is the probability that the sum of the three numbers is divisible by 3?