Sagot :
Answer:
If we fix the positions of the four girls, the three boys can only occupy the spaces between them. Now, we can permute the girls and the boys in their fixed positions, so the number of total permutations is 4! ×3! =144
Answer:
If we fix the positions of the four girls, the three boys can only occupy the spaces between them. Now, we can permute the girls and the boys in their fixed positions, so the number of total permutations is 4! ×3! =144