Question 945086
Q.1.  TOTAL NO OF LETTERS =12
      O OCCURS 2 TIMES,AND I ALSO OCCURS TWO TIMES.
      THEREFORE,TOTAL NO OF ARRANGEMENTS={{{12!/(2!*2!)}}}
Q.2.TOTAL NO OF PEOPLE=20
    NO OF PEOPLE TO BE SELECTED=5
     THEREFORE,NUMBER OF WAYS={{{20C5}}}