Question

how many numbers less than 20 can be written as the sum of two prime numbers​

Answer 1

Answer:

5+5+5+5

5 is a prime number

sum of 5 +5+5+5 make 20

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Answer 2

Step-by-step explanation:

So 2 is the only even number less than 20 that cannot be written as a sum of 2 primes. Any odd integer that is the sum of two primes must be of the form 2+p where p is an odd prime. Hence, for p = 3, 5, 7, 11, 13, 17 we have 5, 7, 9, 13, 15, 19.