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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
3390. A student has learned 20 questions out of 35. What is the probability that he knows the answer to two of the three questions suggested.
Detailed solution. Decorated in Microsoft Word 2003 (Quest decided to use the formula editor)
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