There is a series of numbers: 0, 3, 8, 15, 24, ..., what is the 10th number in this series of numbers.
有一串数：0、3、8、15、24、…，这串数中的第10个数是多少．
<gadget id="calculator">10 - 1</gadget>
<output>9</output>

<gadget id="calculator">10 + 1</gadget>
<output>11</output>

<gadget id="calculator">9 * 11</gadget>
<output>99</output>

<result>99</result>