How r we doing this without knowing the total number of selections to be made....im confused
The question itself is to find the total number of selections.
One of the selection with minimum number of fruits could be to select one from each category. Thus minimum fruits that can be choosen are 3 and maximum fruits that can be chosen are 9. So the number of fruits that can be choosen start from 3 upto 9. For each number the question need to know, how many ways can this selection be made. Example, 3 fruits can only be choosen in one way i.e 1 apple, 1 plum and 1 grapefruit. Similarly 4 fruits can be choosen in many ways
2 apples, 1 plums and 1 grapefruits
1 apples, 2 plums and 1 grapefruits
1 apples, 1 plums and 2 grapefruits
And so on.....
Hope I have not confused you further...