'a' and 'b' are positive integers such that their LCM is 20 and their HCF is 1. What is the difference between the minimum and maximum possible values of 'a + b'?  Select the correct option: A) 0 B) -24 C) -32 D) -20 E) -12
possible values of a and b can be 5,4; 4,5 (which are same for a+b) and 1,20; 20,1 (same result for a+b)   so 9-21 = -12. ans -12.
<result>E</result>
'a' and 'b' are positive integers such that their LCM is 20 and their HCF is 1. What is the difference between the minimum and maximum possible values of 'a + b'?