What is the probability of forming an isosceles triangle with sticks of 5 cm, 5 cm, 3 cm, 7 cm, 3 cm, and 6 cm
用5厘米、5厘米、3厘米、7厘米、3厘米、6厘米的小棒，能围成等腰三角形的可能性是多少
<gadget id="calculator">4 / 7</gadget>
<output>4/7 = around 0.571429</output>

<result>4/7 = around 0.571429</result>