There are 8 yellow balls and 6 white balls in a pocket, they are identical except for their color, and 6 balls are drawn out, what is the probability that all 6 balls are white balls (fill in the marks).
口袋里有8个黄球和6个白球，它们除颜色外完全相同，从中摸出6个球，这6个球都是白球的可能性是多少(填分数)．
<gadget id="calculator">1 / 7</gadget>
<output>1/7 = around 0.142857</output>

<result>1/7 = around 0.142857</result>