Posted by claire on Thursday, April 9, 2009 at 11:49am.
the prob you will pick a correct first number = 4/10
the prob that the second one is correct = 3/9
etc
so the prob of drawing a 1,2,3, and 4
= (4/10)(3/)(2/8)(1/7) = 1/210
or
total number of ways of 'choosing' 4 specifics form 10 is C(10,4) = 210
only one of these will be the correct choice we want.
so prob = 1/120
line << = (4/10)(3/)(2/8)(1/7) = 1/210 >>
should read
= (4/10)(3/9)(2/8)(1/7) = 1/210
and it looks like a transposed the digits in the last line
so prob = 1/210
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