I'm having trouble understanding what the P and ! means in the Probability and Combinatrics problems. On practice test 1, question 14 "In how many different ways (orders) can 5 people stand in line?
The answer is 120 with the reason being: P(5,5)=5!=120
Could someone explain this one to me? I'd really appreciate it.
The answer is 120 with the reason being: P(5,5)=5!=120
Could someone explain this one to me? I'd really appreciate it.