NDA2023MathematicsPermutation and CombinationActual
Three boys, P, Q, R an three girls S, T, U are to be arranged in a row for a group photograph. What is the probability that all three boys sit together?
Options
- A1 5
- B1 4
- C1 3
- D1 12
Correct answer
A. 1 5
Step-by-step solution
The number of ways in which all boys sit together =4! 3 ! Required probability = 4! 3! 6! = 1 5