you have a 4-card deck containing a king, a queen, a jack and a 10. You pick a card, keep it & then pick another card. What is the probability that you pick exactly 1 face card? (face cards are jacks, queens and kings.)

Question

allank · Answer

I like drawing a probability tree. Do you use those @ayojenn ?

anonymous · Answer

no i dont use them o:

anonymous · Answer

but i know what they are!

allank · Answer

Aha, then we can use that. Lemme sketch the outline...

anonymous · Answer

ok :)

allank · Answer

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F stands for Face card, F1 no face card. Make sense so far?

anonymous · Answer

YESS!! :)

allank · Answer

Wonderful. Now, know what we do next?

anonymous · Answer

should we write queen & king on them?

anonymous · Answer

@allank ?

allank · Answer

Not quite...we write the probabilities on the arrows. Right? In the first picking, the probability of F is 3/4 since 3 of the cards are Face cards. So we fill that in like this:
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