Question

L.C.M. of two co-prime numbers is their

• A. sum
• B. difference
• C. product
• D. quotient

Answer 1

Answer: (C)

product

The two numbers which have only 1 as their common factor are called co-primes.
For example, Factors of $5$ are $1,5$
Factors of $3$ are $1,3$
Common factors is $1$.
So they are co-prime numbers.
To find their LCM, we
then choose each prime number with the greatest power and multiply them to get the LCM.
$=>LCM=3\times 5=15$
Hence, LCM of two co-prime numbers is their product.