Calculate the L.C.M of 2/5, 4/ 7, 3/7, 6/13 is : Choose the correct choice from the following options.
A) 15 B) 14 C) 13 D) 12 E) 11
Required L.C.M =L.C.M. of 2, 4, 3, 6/H.C.F. of 5, 7, 7, 13 =12/1= 
<gadget id="calculator">12/1</gadget>
<output>12</output>
12   Answer is 12
<result>D</result>
Calculate the L.C.M of 2/5, 4/ 7, 3/7, 6/13 is :