<PRE><B>Question 248000</B>
A box contains 50 razor blades, five of these are known to be used, the remainder unused. What is the probability that 5 razor blades selected from the box will be unused.
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# of ways to get 5 unused: 45C5
# of ways to pick 5 from 50: 50C5
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P(pick 5 unused) = 45C5/50C5 = 1221759/2118760 = 0.5766

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Cheers,
Stan H.</PRE>