Advertisements
Advertisements
Question
Which of the following are co-primes?
Options
39, 91
161, 192
385, 462
none of these
Advertisements
Solution
161 and 192
39 and 91 are not co-primes as 39 and 91 have a common factor, i.e. 13.
161 and 192 are co-primes as 161 and 192 have no common factor other than 1.
385 and 462 are not co-primes as 385 and 462 have common factors 7 and 11.
APPEARS IN
RELATED QUESTIONS
Write all the prime numbers between:
10 and 40
Make a list of seven consecutive numbers, none of which is prime.
What are co-primes?
Express the following number as the sum of twin prime:
144
State the following statement is True or False.
The sum of two prime numbers is always a prime number.
Show that the following pairs are co-primes:
385, 621
Which of the following is a prime number?
Write 'T' for true and 'F' for false for the following statement.
Every prime number is odd.
Write 'T' for true and 'F' for false for the following statement.
The HCF of two given numbers is always a factor is their LCM.
Which of the following numbers is not a prime?
