Question

5) Calcule o valor ou simplifique:




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Answer 1

Resposta:

B) 210

Explicação passo-a-passo:

N! = N * ( N - 1) * ( N - 2) * ( N - 3)... 3 * 2 * 1

N! = N * ( N - 1) ! = N * ( N - 1) * ( N - 2) ! = ...

7! - 4! = 7 * 6 * 5 * 4! - 4!

7! - 4! = 4! ( 7 * 6 * 5 - 1)

7! - 4! = 4! ( 210 - 1)

7! - 4! = 4 * 3 * 2 * 1 ( 209)

7! - 4! = 24 * 209

7! - 4! = 5016

7! / 4! = 7 * 6 * 5 * 4!/ 4! = 7 * 6 * 5 = 210