Question

19. 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……………

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……………