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January 31, 2015

January 31, 2015

Posted by **claire** on Thursday, April 9, 2009 at 11:49am.

the question is confusing me

- math -
**Reiny**, Thursday, April 9, 2009 at 1:41pmthe 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

- math -
**Reiny**, Thursday, April 9, 2009 at 1:44pmline << = (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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