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Probability
Level
1
Seven boys and five girls are to be lined up in a row for a photo shoot. In how many ways can they pose for a picture if boys and girls alternate?
The answer is 0.
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1 solution
Since there are five girls, five boys should be placed alternately with each girl; leaving two boys in excess. However, we want, boys and girls to alternate in position, hence, the two excess boys violate the desired condition, and so, the required answer is 0 .