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If a card is chosen from a standard deck of cards, what is the probability of getting a five or a seven?
4/52
1/26
8/52
1/169

If two cards are chosen from a standard deck of cards, what is the probability of getting a five followed by a seven? (assume replacement of the first card)
1/13 * 1/13
1/13 * 1/12
1/13 + 1/13
¼ + ¼

explain replacement of first card? thx

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  1. There are 4 fives and 4 sevens, so we are interested in 8 specific cards
    prob(5 or 7) = 8/52 = 2/13
    (they should reduce their answers to lowest term fractions)

    Prob(5, then a 7) = (4/52)(4/52) = 1/169
    (oh, now they reduce the fractions to lowest terms, love the consistency)

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