There are 20 raffle tickets, numbered 1 to 20, in a box.
Three prizes are given away by choosing three tickets from the box. One ticket can win one prize only.
The first ticket drawn is number 15 and wins the third prize.
Which of the following is not possible?

Second prize is won by number 2. 

First prize is won by a prime number. 

Second prize is an even number. 

First prize is won by number 15. 