It is known that A=2*2*3*7, B=2*3*5*7, then what is the greatest common factor of A and B
已知A=2*2*3*7，B=2*3*5*7，那么A和B的最大公因数是多少
<gadget id="calculator">2 * 3 * 7</gadget>
<output>42</output>

<result>42</result>