Question 144614
we can get exactly three apples in {{{5C3}}} ways but since we have to select four pieces so one orange can be selected in {{{3C1}}}ways now by product rule 
total ways to select four pieces = {{{5C3}}}*{{{3C1}}} 
                                 ={{{5!/3!(5-3)!}}}*{{{3!/1!(3-1)!}}}
                                 = {{{120/6(2)!}}}*{{{6/2!}}}
                                 =12*3
                                 =36