Detailed Instructions: In this task, you need to answer the given multiple-choice question on the general math. Classify your answers into 'a', 'b', 'c', 'd', and 'e'.
Q: Problem: find the lowest common multiple of 24 , 36 and 42 .
Options: a ) 360 , b ) 504 , c ) 510 , d ) 320 , e ) 280
A:
b