Question

The sum of two composite number may be a prime number its true or false

Answer 1

Answer is true, for an example take two composite no 8 and 9. Even the sum is 17, which is a prime number.

Let n be a number which is a sum of two numbers, and at least one is prime.

This gives n=p+c, where p is the prime number and c is the composite number.

Even composite number can be written as a product of primes. So I can say, n=p+pe11.pe22...pekk.