Question

Find the number of ways of arranging 4 boys and 3 girls in a row so that the row always begins with a boy and ends with a girl

Answer 1

Answer:

5!

Step-by-step explanation:

see the pictures it use of permutations and combination of maths but use logical matheod

Answer 2

Answer:

1440

Step-by-step explanation:

The first place can be filled with any body in 4 ways and similarly, the last place can be  filled with a girl in 3 ways .

B _ _ _ G

Now, the remaining 5 places can be filled with the remaining 5 persons (3 boys and 2  girls) in 5! ways. Hence, the number of the required arrangements is

4 * 3 * 5! = 1440