A scientist used a unique two-color code to identify each of the test subjects involved in a certain study. If the scientist found that choosing from among seven colors produced enough color codes to identify all but 5 of the test subjects, how many test subjects were in the study? (Assume that the order of the colors in the codes does not matter.) Pick: A) 25 B) 26 C) 27 D) 28 E) 29
7C2 = 21   The number of test subjects is  21 + 5= 
<gadget id="calculator"> 21 + 5</gadget>
<output>26</output>
26   The answer is 26.
<result>B</result>
A scientist used a unique two-color code to identify each of the test subjects involved in a certain study. If the scientist found that choosing from among seven colors produced enough color codes to identify all but 5 of the test subjects, how many test subjects were in the study? (Assume that the order of the colors in the codes does not matter.)