Six scientists A, B. C, D, F+ 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 present in the afternoon session. The lectures have to be scheduled in such a way that they comply with the following restrictions:
B 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.
In case C is to be the fifth scientist to present his paper, then B must be
B could be placed at any of the following places in the order of presenters EXCEPT
In case F is to present his paper immediately after D presents his paper, C could be scheduled for which of the following places in the order of presenters?
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In case F and E are the fifth and sixth presenters respectively then which of the following must be true?
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