Question 489525: There are 25 trays on a table in the
cafeteria. Each tray contains a cup
only, a plate only, or both a cup and a
plate. If 15 of the trays contain cups
and 21 of the trays contain plates, how
many contain both a cup and a plate?.....plz help me out in this prob
2)A set has property X if t t 2 is in the
set whenever t is in the set. Which of
the following sets has property X ?
(A) 2, 1,0
(B) 1,0
(C) 1,0,1
(D) 0,1
(E) 1,2
Answer by chessace(471)   (Show Source):
You can put this solution on YOUR website! Since there are no empty trays, answer is total objects - trays
(15+21)-25 = 11.
2nd one looks interesting, but also like a typo, needs spelling out of the "if" condition.
|
|
|
