anonymous
  • anonymous
Scott has eight CDs, and he picks two to take to work each day. How many different ways can Scott choose two CDs? a.)56 B.)28 C.)20,160 D.)112
Mathematics
katieb
  • katieb
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anonymous
  • anonymous
\[\frac{8\times 7}{2}\]
anonymous
  • anonymous
\( {8 \choose 2} =28\) so, B is correct.
anonymous
  • anonymous
8 choices for first one, then 7 for second one, and since order doesn't matter you divide by 2 because there is no difference between picking first slayer and then britney spears, or first britney spears and then slayer

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perl
  • perl
pop culture reference :O
perl
  • perl
you divide by 2 because you have overcounted twice as much,

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