Find the lowest common multiple of 24, 36 and 42.  Pick
A) 360  B) 504  C) 510  D) 320  E) 280
LCM=2*2*2*3*3*7= 
<gadget id="calculator">2*2*2*3*3*7</gadget>
<output>504</output>
504.   Answer is 504
<result>B</result>
Find the lowest common multiple of 24, 36 and 42.