What is the probability that two balls are randomly drawn from a pocket containing 3 white balls and 2 black balls?
从装有3个白球，2个黑球的口袋中任意摸出两球，全是白球的概率是多少．
<gadget id="calculator">3 + 2</gadget>
<output>5</output>

<gadget id="calculator">3 / 5</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">3 - 1</gadget>
<output>2</output>

<gadget id="calculator">5 - 1</gadget>
<output>4</output>

<gadget id="calculator">2 / 4</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">(3/5) * (1/2)</gadget>
<output>3/10 = around 0.3</output>

<result>3/10 = around 0.3</result>