Question

There are 5 letters and 5 addressed envelopes. if the letters are put at random in the envelops, the probability that all the letters may be placed in wrongly addressed envelopes is. (a) 119 (b) 40 *(c) 44 (d) 53

Answer 1

after the typist writes 12 letters and addresses 12 envelopes, she inserts the letters randomly into the envelopes (1 letter per envelope). what is the probability that exactly 1 letter is inserted in an improper envelope……………