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,

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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

Answer: D

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