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Q: How many ways can you express 201 as a sum of 3 prime numbers?

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It would be 5 ways

5

5

23,3 19,7 13,13

Three ways (I think).

There are many ways to do prime factorisation for 20. It is not prime as it has more than 2 factors. The beginning of the prime factorisation is correct, but it is incomplete. These are two ways to complete it. 20 4x5 2x2x5 or 20 2x10 2x2x5 You have to continue using factorisation on all the numbers until all the numbers are prime. The prime numbers will always be the same if it starts with the same original number.

There are six ways to arrange three different numbers.

there are many (infinite) ways but just one is 72=2*(31+5)

Two, if the order of the primes is ignored.

Three ways. 3 + 37 11 + 29 17 + 23

24 = 11 + 13 = 5 + 19

Eight different ways.Eight different ways.Eight different ways.Eight different ways.

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