Professor asked 42 students when they had studied for his class the previous week. Their responses were as follows; 9 had studied on Friday 18 had studied on Saturday 30 had studied on Monday 3 had studied on both Friday and Saturday 10 had studied on both Saturday and Monday 6 had studied on both Friday and Monday 2 had studied on Friday, Saturday and Monday a)   Represent the above information using a Venn diagram.                    [4 Marks] b)   Calculate the number of students who:  i.             Did all of their studying on one day.                                     [2 Marks]                                                                                              ii.            Studied on Monday but not on either Friday or Saturday.         [2 Marks] iii.           Did not study at all for this class last week.                            [2 Marks]​