The format of P(n, r) is used for permutations, where P(n, r) = n! / (n - r)!. This means that P(9, 2) = 9! / (9 - 2)! = 9! / 7! = 9*8 = 72. Meanwhile, P(6, 4) = 6! / (6 - 4)! = 6! / 2! = 6*5*4*3 = 360. Therefore, the product of P(9, 2) and P(6, 4) = 72*360 = 25920.
