City High School must put together a debating team consisting of four debaters.There are candidates of equal ability : X,Y and Z who are all seniors; and A,B,C and D who are all juniors..The school requires that there should be two seniors and two juniors in the team.It is also necessary that all of the debaters be able to work with one another. *Debaters Y and A cannot work together. *Debaters Z and C cannot work together. *Debaters A and B cannot work together. If debater A is in the team,which other debaters must be in the team as well?
A. X,Y and B
B. X,Z and D
C. X,Z and B
D. X,Z and C
সঠিক উত্তরঃ
B.
X,Z and D
Explanation:
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