There are 3 mutually unequal numbers, A says it is 2, a+1, b+2; B says it is 2b-1, 3, a. If both are correct, what is the product of these three numbers?
现有3个互不相等的数，甲说是2，a+1，b+2；乙说是2b-1，3，a．若两人都说对了，则这三个数的乘积是多少．
<gadget id="calculator">3 + 2</gadget>
<output>5</output>

<gadget id="calculator">2 * 3 * 5</gadget>
<output>30</output>

<result>30</result>