What is the value of $\frac{x^1\cdot x^2\cdot x^3\cdots x^{10}}{x^2\cdot x^4 \cdot x^6 \cdots x^{20}}$ if x = 2?

Simplifying gives x^55/x^110, which equals 1/x^55. The answer should be 1/(2^55).