Sagot :

Mozi

Bonsoir,

p = [(2-1) / 2] * [(3 - 1) / 3] * [(4 - 1) / 3] * ... * [(2019 - 1) / 2019] * [(2020 - 1) / 2020]

p = (1/2) * (2/3) * (3/4) * ...*(2018/2019) * (2019/2020)

p = (1 * 2 * 3 * ... * 2018 * 2019) / (2 * 3 * 4 * ... * 2019 * 2020)

p = 1/2020