Answer to Question #91848 in Algebra for Ahmed

Question #91848

Choose the answer you think is most appropriate among the given options.Six scientists A, B, C, D, E, and F are to present a paper each at a one-day conference,Three of them will present their papers in the morning session before the lunch break whereas the other three will be presented in the afternoon session. The lectures have to be scheduled in such a way that they comply with the following restrictions:B's should present his paper immediately before C's presentation; their presentations cannot be separated by the lunch break.D must be either the first or the last scientist to present his paper.45. In case C is to be the fifth scientist to present his paper, then B must be.
Answers
Choose an answer
First
Second
Third
Fourth
Sixth

Expert's answer

If C is to be the fifth scientist, the B is the fourth, because he should present his paper immediately before C's presentation.

So, the correct answer is fourth.