Question

Помогите, пожалуйста!!!
вычислить

Answer 1

n! = 1*2*3*....*n

0! = 1

Aₐᵇ = a! / (a - b)!

A₁₁³ = 11! / (11 - 3)! = 11! / 8! = 9*10*11

A₁₀² = 10! / (10 - 2)! = 10! / 8! = 9*10

A₉¹ = 9! / (9 - 1)! = 9! / 8! = 9

(A₁₁³ - A₁₀²) / A₉¹ = (9*10*11 - 9*10) / 9 = 10*11 - 10 = 100