\frac{5}{6}
<|im_start|>system
You are a helpful assistant.<|im_end|>
<|im_start|>user
Express the following sum as a simple fraction in lowest terms.

$$\frac{1}{1\times2} + \frac{1}{2\times3} + \frac{1}{3\times4} + \frac{1}{4\times5} + \frac{1}{5\times6}$$
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
<|im_start|>assistant

user
\frac{5}{6}
Express the following sum as a simple fraction in lowest terms.

$$\frac{1}{1\times2} + \frac{1}{2\times3} + \frac{1}{3\times4} + \frac{1}{4\times5} + \frac{1}{5\times6}$$
train