HCF of two numbers is 1 and LCM is 221. If one of the two numbers is 17, find the other.
The correct option is A 13
Let the unknown number be x.
Second number is 17.
Now, HCF × LCM = product of the two numbers
⇒1×221=17×x
⇒17x=221
⇒x=22117
⇒x=13
∴ The unknown number is 13.