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a card is picked from a pack containing 52 cards . it is then replaced and a second card is picked. Find the probability that
a)both cards are the seven of diamonds,
b)the first card is a heart and the second a spade.
c)one card is from a black suit and other is from a
red suit
d) at least one card is a queen

  • math -

    I will do two:
    b) Pr= 13/52 * 13/52
    d)Pr(one a queen)= pr(two queens)+pr(one queen)
    Pr(QQ)+Pr(QN)+Pr(NQ)
    4/52*4/52 + 4/52*48/52 + 4/52*48/52
    = (16+2*4*48)/52*52=.148 check it.

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