znanija.com/task/35320434 ( оригинал .... /task/35320989 )
Вычислите 3P₃ + 2 A₁₀² - C₇²
информация к размышлению
P(n) = n ! = 1*2*....*(n-1)*n n∈ N * * * 0 ! = 1 * * *
Aₐᵇ = a! / (a - b) !
Cₐᵇ = a ! / b! * (a - b) !
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P(3) = 3! = 1*2*3 = 6
A₁₀² = 10!/(10 - 2)! = 10!/8! = 8!*9*10/8! = 9*10 = 90
C₇² = 7!/2!*(7 - 2)! = 7!/2!*5! = 6*7/2 = 21
3P₃ + 2 A₁₀² - C₇² = 3*6 + 2*90 - 21 = 18 + 180 - 21 = 177
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znanija.com/task/35320434 ( оригинал .... /task/35320989 )
Вычислите 3P₃ + 2 A₁₀² - C₇²
информация к размышлению
P(n) = n ! = 1*2*....*(n-1)*n n∈ N * * * 0 ! = 1 * * *
Aₐᵇ = a! / (a - b) !
Cₐᵇ = a ! / b! * (a - b) !
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
P(3) = 3! = 1*2*3 = 6
A₁₀² = 10!/(10 - 2)! = 10!/8! = 8!*9*10/8! = 9*10 = 90
C₇² = 7!/2!*(7 - 2)! = 7!/2!*5! = 6*7/2 = 21
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3P₃ + 2 A₁₀² - C₇² = 3*6 + 2*90 - 21 = 18 + 180 - 21 = 177