7. In how many ways can 5 boys and 5 girls be arranged in a row for picture taking if: a. all boys are together? b. boys and girls are arranged alternately?
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So, we have 6 entities to arrange: the group of boys and the 5 girls. The number of ways to arrange these 6 entities is 6!. However, within the group of boys, the boys can be arranged among themselves in 5! ways. So, the total number of ways to arrange the boys Show more…
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