Question

Consider a set of vectors xi+yj+zk where x,y,z €{1,2,3}
Three vectors are selected at random from set A.If the probability that they mutually perpendicular is p then

Answer 1

p is??

Answer 2

Options are
A).p<1/27
B).p€(1/27,1/9)
C).p€(1/9,1/3)
D).p€(1/3,1)

Answer 3

Oops! I got it..