SUZIE HAD TO WRAP A TRUCK,A CAR, A BUS AND A TRAIN. IN HOW MANY DIFFERENT ORDERS CAN SHE WRAP THESE PRESENTS?
She has four choices for wrapping the first, 3 remaining choices for the second, 2 choices for the third, and 1 choice for the last.
By the multiplication principle, she can wrap in 4*3*2*1=4! different orders.