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math - help please

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Assume that 2 cards are drawn in succession and without replacement from a standard deck of 52 cards. Find the probability that the following occurs: the second card is a 9, given that the first card was a 9.

  • math - help please - ,

    Use the definition of conditional probability:
    P(X9|9X) in the previous question.
    P(X9∩9X)/P(9X)
    =P(99)/P(9x)
    =(4/52)*(3/51) / (4/52)
    =3/51

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