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Earn +20 ptsQ: What three prime numbers make up the number 231?
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What three prime numbers make 251?
None. 251 is a prime number.
What three prime numbers which multiply to make231?
The three prime numbers which multiply to make 231 are 3 x 7 x 11.
How many ways can the whole number 50 be expressed as the sum of three different prime numbers?
Look at the first 2 of these prime numbers. They cannot be even for then they would be divisible by 2, so not prime. Add them together. Two odd numbers added together make an even. Subtract this even number from 50 (also even) so the third number must be even. There is no way of adding 3 prime numbers together to make an even number.
Can i make any number that isn't a prime number by adding 2 prime numbers?
No, for example you can't create the number 65, which is not a prime number, by adding any two prime numbers.
What name is given to prime numbers that you can reverse to make another prime number?
A mirror prime.
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