Stats question

[happydude]

I'm currently taking Stat213 and had a quiz with the following question on it. The answer I got and what the TA got are totally different, so I was hoping someone could show me exactly how these are supposed to be done. The TA wrote some stuff on the quiz that doesn't seem to make sense and I can't find her around anywhere to ask her.

One card is selected at random from an ordinary deck of 52 playing cards

A=(event that a 2,3, or 4 is selected)
B=(event that a jack, queen, or king is selected)
C=(event that a heart is selected)

Find the following probabilities:

P(B)
P(B|A)
P(B|C)
P(B|A*)

*=complement

Any help would be greatly appreciated.:thumbsup:

[PeterGTiR]

I haven't taken stats for a while, but I'm just guessing:

12/52
24/52
21/52
42/52

Are those the right answers? I won't explain unless they are right...

[pyar_deewane]

yo dude im takin stats 213, whos ur teacher lol

[pyar_deewane]

p(B) is 52c12
for the rest my guess is as good as urs lol

[Eleanor]

Man I wish our stats were this easy.

[a social dsease]

I got

12/52
0
12/52
12/40

Formula I used for all was P(A|B) = P(A & B) / P(B)

(in the above formula its not really a "&", its an upside down U, but it means the same as "and")

[IncredibleToad]

there really is a difference between engineering and the outside world... get me outta the engg dungeon!