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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%
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$0.32
3902. In the box there are parts of 3 types. Of these, 30-first 20-second and 50-third. Among the parts of the first type 20% painted, the second type 30%, the third type 40%. Find the probability that the extracted part is painted for good luck.
Detailed solution. Decorated in Microsoft Word 2003 (Quest decided to use the formula editor)
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