Question

SIMPLIFIQUE AS QUESTÕES A E B

Answer 1

a) (n + 5)!/(n + 3)! = (n + 5)(n + 4)(n + 3)!/(n + 3)!

∴ (n + 5)!/(n + 3)! = (n + 5)(n + 4) = n² + 9n + 20

b) (n - 8)!/(n - 10)! = (n - 8)!/(n - 10)(n - 9)(n- 8)!

∴ (n - 8)!/(n - 10)! = 1/(n - 10)(n - 9) = 1/(n² - 19n + 90)