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This question is improperly worded, I will assume you did not mean to have an 's' after the word 'prime'.

Now you should know, neither 1 nor 0 is considered to be prime. So the only prime numbers under 7 that we can work with here are 2, 3, and 5. Using 3 digits, there is only 1 possible combination here: 2 + 2 + 3 = 7. Do not be tempted to put 5 + 2 + 0 = 7 or any other combination because, as I said before, 0 and 1 are not prime numbers.

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Q: How many ways can 7 be the sum of 3 primes numbers?
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