GRE Question of the Day (November 15th)

Math

A secretary types 4 letters and then addresses the 4 corresponding envelopes. In how many ways can the secretary place the letters in the envelopes so that NO letter is placed in its correct envelope?

A) 8
B) 9
C) 10
D) 12
E) 15

Correct Answer - B - (click and drag your mouse to see the answer)

Question Discussion & Explanation