If Clara owns 7 boxes of cardboard of the 12 boxes placed on a table, and 2 boxes are to be picked from the table at random, what is the probability that the boxes picked at random are not Clara's?. Pick one.
A) 5/33	B) 4/33	C) 7/33	D) 2/7	E) 7/12
Since Clara owns 7 of the boxes, the subset from which the boxes should be chosen are the 5 pictures not owned by clara from the universe of 12.   The first picture can be one of the 5 from the 12 with probability 5/12   The second picture can be one of the 4 from the 11 remaining with probability 4/11   The total probability will be 5/12 × 4/11. On cancellation, this comes to 5/33.   Thus, the answer is 5/33 - 5/33.
<result>A</result>
If Clara owns 7 boxes of cardboard of the 12 boxes placed on a table, and 2 boxes are to be picked from the table at random, what is the probability that the boxes picked at random are not Clara's?.