Observe the following sequence: (1/2), (1/3), (2/3), (1/4), (2/4), (3/4), (1/5), (2/5 ), (3/5), (4/5)..., (9/77), what is the ranking position?
观察以下数列：(1/2)，(1/3)，(2/3)，(1/4)，(2/4)，(3/4)，(1/5)，(2/5)，(3/5)，(4/5)…，(9/77)，排在第多少位置．
<gadget id="calculator">2 + 76</gadget>
<output>78</output>

<gadget id="calculator">74 / 2</gadget>
<output>37</output>

<gadget id="calculator">78 * 37</gadget>
<output>2_886</output>

<gadget id="calculator">2_886 - 66</gadget>
<output>2_820</output>

<result>2_820</result>