Question 659076
From a pack of 52 cards, seven are taken at random, examined and replaced. The 
cards are shuffled and another seven are drawn at random. Find the probability that at 
P(least one card will be drawn twice) = 1 - (no card is picked twice)
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= 1 - (1/52)^2
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= 1 - (1/52)(51/52)
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= 1 - 51/52^2
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= 1 - 0.019
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= 0.981
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Cheers,
Stan H.