A awesome mathematics problem | Olympiad Question | can you solve this problem | n=?

#quantativeaptitude #maths #olympiad#rational#exponents #integral
france math olympiad question | can you solve this? | n=?, can you solve this math problem,can you solve this challenging problem?,can you solve this equation,can you solve this puzzle,learn how to solve this challenging problem,can you solve this maths puzzle,math olympiad algebra problem,how can solve this puzzle,math olympiad problem,olympiad mathematics,math olympiad problems,mathematics olympiad,mathematics

[paulortega]

Or after n(n - 2)(n + 2)(n - 4) = 20 let u = n -1, n = u + 1
(u - 3)(u + 3)(u - 1)(u + 1) = 20
(u² - 9)(u² - 1) = 20
u⁴ - 10u² + 9 = 20
(u² - 5)² = 36
u² = 5 ± 6
u² = -1, 11
u = ± i, ± √11
n = 1 ± i, 1 ± √11

[АллаХалимонова]

Почему опять даёте условие с ошибкой, на этот раз потеряли п? Мне интересно самой решить, потом смотреть решение.