In how many ways can five children stand in a queue?
Given: There are five children
To find: The number of ways in which these children can stand in a queue
Formula used:
Number of arrangements of n things taken all at a time = P(n, n)
∴The total number of ways in which five children can stand in a queue
= the number of arrangements of 5 things taken all at a time
= P(5, 5)
{∵ 0! = 1}
= 5!
= 5 × 4 × 3 × 2 × 1
= 120
Hence, Number of ways in which five children can stand in a queue are 120