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OpenStudy (anonymous):
Using the letters R, S, and T, find how many different two-letter combinations you can create. A. 1 B. 3 C. 4 D. 5 I chose B Rs RT sT IS THAT CORRECT?
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OpenStudy (anonymous):
you can actually come up with 6 st ts rs sr rt tr
OpenStudy (anonymous):
Yes it depends on whether a difference in order counts as a new combination, and in this case, it should.
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