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In how many arrangements can a teacher seat 3 girls and 3

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In how many arrangements can a teacher seat 3 girls and 3 [#permalink] New post 24 Sep 2003, 11:41
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In how many arrangements can a teacher seat 3 girls and 3 boys in a row of 6 seats if the boys are to have the first, third, and fifth seats?

A) 6
B) 9
C) 12
D) 36
E) 720
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 [#permalink] New post 25 Sep 2003, 04:52
Yes, but why? Can you explain it in your words? :roll:
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anwer [#permalink] New post 27 Sep 2003, 05:52
well

3!*3! B1G1B2G2B3G3

so in fact u got B1B2B3 (3!) and G1G2G3 (3!)
what makes together 6*6 =36
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anwer   [#permalink] 27 Sep 2003, 05:52
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