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Earn +20 ptsQ: What two prime numbers have a sum of 20?
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What are Two prime numbers whose sum is 20?
3 and 17
Express 20 as a sum of 2 prime numbers?
3 + 17 = 20
What three prime numbers have a sum of 20?
They are: 2+7+11 = 20
How many of the prime numbers between 10 and 20 can be written as the sum of two primes?
All prime numbers greater than 2 are odd numbers. For an odd prime to be written as the sum of two primes, one of the primes must be 2 because two odd primes will produce an even sum. 11 cannot be written as the sum of two primes. 13 = 2 + 11. 17 cannot be written as the sum of two primes. 19 = 2 + 17.
Is the sum of two composite numbers also composite?
Not always as for example 20+9 = 29 which is a prime number
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