a scientist used a unique two-color coe to identify each of the rest subjects involved in a certain study. if the sicnetist found that choosing from among six colors produced enough color codes to identify all but 5 of the rest subjects, how many test subjects were in the study? ( assume that the order of the colors in the codes does not matter.)
A) 7
B) 10
C) 15
D) 17
E) 20
Plesase explain. I do not know the answer though.
A) 7
B) 10
C) 15
D) 17
E) 20
Plesase explain. I do not know the answer though.
