How many numbers less than 20 can be written as the sum of two prime n

1.	How many numbers less than 20 can be written as the sum of two prime numbers?
Answer» <html><body><p>-step explanation:So 2 is the only even number less than 20 that cannot be <a href="https://interviewquestions.tuteehub.com/tag/written-732709" style="font-weight:bold;" target="_blank" title="Click to know more about WRITTEN">WRITTEN</a> as a sum of 2 <a href="https://interviewquestions.tuteehub.com/tag/primes-1166022" style="font-weight:bold;" target="_blank" title="Click to know more about PRIMES">PRIMES</a>. Any odd integer that is the sum of two primes must be of the form 2+<a href="https://interviewquestions.tuteehub.com/tag/p-588962" style="font-weight:bold;" target="_blank" title="Click to know more about P">P</a> where p is an odd prime. Hence, for p = 3, <a href="https://interviewquestions.tuteehub.com/tag/5-319454" style="font-weight:bold;" target="_blank" title="Click to know more about 5">5</a>, 7, 11, 13, 17 we have 5, 7, 9, 13, 15, 19.</p></body></html>

Discussion