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Loyalty discount! If the total amount of your purchases from the seller more than:

$3 the discount is 1%
$6 the discount is 2%
$9 the discount is 3%
$12 the discount is 4%
$15 the discount is 5%
$18 the discount is 6%
$20 the discount is 7%
$30 the discount is 10%
$0.32
3438. Of the 12 lottery tickets, among which there are 4 winning, take at random 6. What is the probability that at least one of them is winning?
Detailed solution. Decorated in Microsoft Word 2003 (Quest decided to use the formula editor)
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