Answer:
P (10,3) = 720
Step-by-step explanation:
Permutation, order is considered (first, second, third)
P (n,r) = \frac{n!}{(n-r)!}
(n−r)!
n!
P (10, 3) = \frac{10!}{(10-3)!}
(10−3)!
10!
P (10, 3) = \frac{10!}{7!}
7!
10!
P (10, 3) = (10×9×8×7×6×5×4×3×2×1) ÷ (7×6×5×4×3×2×1)
P (10,3) = 10×9×8
P (10,3) = 720
