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02 Sep 2006, 10:55
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Something to brush up your basics...yup am revising prob. today 
Q1. If someone draws a card at random from a deck and then, without replacing the first card, draws a second card, what is the probability that both cards will be aces?
Q2. If someone draws a card at random from a deck and then replaces the first card, draws a second card, what is the probability that both cards will be aces?
Q1. If someone draws a card at random from a deck and then, without replacing the first card, draws a second card, what is the probability that both cards will be aces?
Q2. If someone draws a card at random from a deck and then replaces the first card, draws a second card, what is the probability that both cards will be aces?
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02 Sep 2006, 11:30
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Futuristic
P(Ace on 1st draw) = 4/52 = 1/13
P(Ace on 2nd draw) = 3/52 = 1/13 (with replacement)
Hence answer = 1/13 * 1/13 = 1/169
Does this seems correct ?
