<PRE><B>Question 398543</B>
There are nine balls numbered one through nine. You draw four balls at the same time. What is the probability that the sequence 2,5,7,9 will be drawn? I have tried the counting principle and my answer was .00033 but this is not one of my choices.
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2579 is one sequence out of 9*8*7*6 sequences
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P(2,5,7,9) = 1/3024 = 0.00033
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I get what you got.
Note: The answer book does not always have the right answer.
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By the way we are counting a sequence, which has order.
It may be the problem is looking for the group {2,5,7,9}
which is one group out of 9C4 = 126
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That probability would be 1/126 = 0.007937..
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Cheers,
Stan H.</PRE>