The HCF of two numbers is 42 and the other two factors of their LCM are 10 and 20. What is the largest number.
Choose the correct choice from the following:
A) 462
B) 450
C) 840
D) 504
E) 555

Rationale: "explanation : hcf of the two numbers = 42 hcf will be always a factor of lcm 42 is factor of lcm other two factors are 10 & 20 then the numbers are ( 42 * 10 ) and ( 42 x 20 ) = 420 and 840 answer : option c"
Answer: C