Question

1 There are 10 students in class including 3
girls. The number of ways to arranged
them
in a row when any 2 girls
out of 3
never comes together​

Answer 1

Total number of students =10

There are 7 boys and 3 girls.

Seven boys can be arrange in a row 7P7=7!ways.

So, 8 places in which we can arrange 3 girls are 8P3=(8−3)!8!=336ways

The number of arrangement is 7!×336ways.