Interview Question: Magical Cards

Sample Question #73 (probability theory)

A normal deck of playing cards is shuffled. The first card you are dealt is a 5. What’s the probability that the next card is also a 5?

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One Response to Interview Question: Magical Cards

  1. Brett says:

    This one is incredibly easy! After the first card, how many 5’s are left? How many cards in total are left? You got the answer.
    Unfortunately, many candidates, including some with Ph.D.s, fail to be able to answer this question. Probability questions can usually be solved by deriving the numerator and the denominator by counting. Hope you enjoyed this question. 

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