ExplanationThe order of friends doesn’t matter.

There are five friends to choose from for three spots, so the top of your fraction should read: 5*4*3, and to correct for the order of friends not mattering, the bottom of your fraction should be: 321.

\frac{5 \times 4 \times 3}{3 \times 2 \times 1}= 10.

Since he is numbering possibilities sequentially, the numbers 1 through 10 will be on the list, making

choices (A) and (B) correct.
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Sandy

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