AMC Úc 2021 - Khối9–10 Câu hỏi 24

Tích $\left(1-\frac1{2^2}\right)\left(1-\frac1{3^2}\right)\left(1-\frac1{4^2}\right)\cdots\left(1-\frac1{15^2}\right)$ bằng