<|im_start|>system
You are a helpful assistant. You first thinks about the reasoning process in the mind and then provides the user with the answer.<|im_end|>
<|im_start|>user
In the Countdown Game, you are given 4 numbers: [17, 2, 6, 13]. Your goal is to reach the exact target number 51 using basic arithmetic operations only once and placing each number exactly once. You must use these exact operations: +, -, *, /, in the order of their occurrence. Remember, there are no rounds or decimal points allowed! Below is a statement showing the working. Use <think> </think>, <answer> for your working and the final equation respectively.<|im_end|>
<|im_start|>assistant
Let me solve this step by step.
<think>