Calculate the L.C.M of 4/9, 5/ 7, 9/13, 7/15 is :	Choose the correct choice:
A) 1230 B) 1290 C) 1260 D) 1240 E) 2260
Required L.C.M =L.C.M. of 4, 5, 9, 7/H.C.F. of 9, 7, 13, 15 =1260/1= 
<gadget id="calculator">1260/1</gadget>
<output>1_260</output>
1260   Answer is 1260
<result>C</result>
Calculate the L.C.M of 4/9, 5/ 7, 9/13, 7/15 is :