Answer:
Kevin and Vijay are chatting
Step-by-step explanation:
Consider: Kevin=k
Heather=h
Randyor=v
Vijay=v
Abby=a
The values or the variables can be =o if they are not chatting and =1 if they arre chatting, then:
k+h>=1
v+r=1
a=r
v=k
if h=1 then a=1 and k=1, then as a=r, r=1 and as v=k, v=1, but then v+r=2, which is not possible because v+r=, then we can fisrt conclude than h=0.
.As k+h>=1, and h=0, then k=1. As k=v, then v=1.
As v+r=1, and v=1, then r=0. As r=a, a=0
So in conclusion, a=0, r=0, v=1, k=1 and h=0, so Kevin and Vijay are chatting
