ok lets try another probability problem....
i have 3 cards, the first has a 3 on it, the second has a 5 on it and the third has a 9 on it.
the question states that the 3 cards were taken from a box of 10 cards, each with a different integer on it from 1 to 10. what is the probability that the next two cards selected from the box will have both even integers on it?
ok so there are 7 cards remaining, each with 1, 2,4, 6, 7, 8 and 10.
so on our first try we get 5/7
on our second try we get 4/6 or 2/3?
so 5/7 times 2/3 =10/21
is this right?