LetAbetheeventthatastudentisenrolledinanaccountingcourse,andletSbetheeventthatastudentisenrolledinastatisticscourse.Itisknownthat30%ofallstudentsareenrolledinanaccountingcourseand40%ofallstudentsareenrolledር୔滀ංං뗐敔敔滀ං�敘滀ංﲘǛ瘓血ி㰰ǚ㰰ǚብ盂즦තЀ￾￿￾￿ೈርብ盂
Ѐ㰰ǚ￾￿睽Ԝ盜Љ
䕄ǒ灐ංء