There are 4 ways that a right triangle may be oriented with axis-aligned catheti. So, the problem should probably ask that the angles follow a certain order, or show the triangle with labeled legs.
Which values occur exactly three times?
sum of first 'n' terms
Replacing a row
UICBioE240 problem 1.9
UICBioE240 problem 1.16
UICBioE240 problem 1.14
UICBioE240 problem 1.12
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