Question

срочно нужна помощь прошу

Answer 1

1. С⁴ₓ=A³ₓ
x!/(4!*(x-4)!)=x!/(x-3)!
1/(4!*(x-4)!=1/(x-3)!
4!*(x-4)!=(x-3)*(x-4)!
4!=x-3
24=x-3
x=27
2. p(x)=(1-3x)⁵
C₅³ * (3x)³=5!/(3!*2!) * 27x³= 10*27x³=270x³
Коэффициент 270.
3. С¹₁₅*С²₂₀=15!/(14!*1!) * 20!/(18!*2!)=15*190=2850