15: In how many ways can 4 boys and 5 girls be seated in a row so that – InterviewSolution

1.	15: In how many ways can 4 boys and 5 girls be seated in a row so thatthey are alternate?
Answer» they need to alternateso BGBG.... or GBGB..so ways=2(5×4×4×3×3×2×2×1×1)=5760

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