Araffle jar contains 10 purple tickets, 7 blue tickets, and 4 red tickets. what is the probability of randomly selecting a blue ticket, and without replacing it, then randomly selecting a purple ticket? a.2/21 b.1/10 c.1 /7 d. 1/6

You have 7 blue tickets and 21 total.
So the odds of pulling a blue ticket is 7
                                                         21
If you replace the ticket, the total number of tickets changes, so the total is 20 tickets.
The odds of pulling a purple ticket is 10
                                                          20
So the odds that you pull a blue, replace it, then pull a purple is:
 7  * 10  =  70  = 1
21    20     420    6
so your answer is 1/6 or D