Question

what are prime and co prime numbers

Answer 1

Prime numbers: The numbers which have only two factors ie. 1 and the no itself are called as prime nos.
ex: 2,3,5,7,11,etc

note that 1 is neither prime nor composite no.

Co prime: the nos that have only one common factor ie.1 are called as co prime nos.

ex 1,3
3,4
5,8 etc

Answer 2

Answer:

prime numbers r numbers which have 1 and itself number as its factor

co-prime numbers r numbers which have a common factor as 1 only