Permutation & Combination

Quantitative Aptitude (SBI-CL)

Title

45:30

8 of 24 completed

5 of 15 completed

38 of 100 completed

8 of 20 completed

Indian Economy - Understanding the basics of Indian economic system

In how many ways can 4 boys and 5 girls be seated in a row so that they are alternate?

2180

2680

2880

2480

G B G B G B G B G

The diagram shows the possible arrangement of sitting of boys and girls.

Now, 4 boys can be seated in 4 places in 4P4 = 4! and 5 girls in 5 places in 5! ways.

Reqd no. of ways = 4! × 5! = 24 × 120 = 2880