How many distinct composite numbers can be formed by adding

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How many distinct composite numbers can be formed by adding 2 of the first 5 prime numbers?
SAT1的数学题,这题怎么理解?

the first five prime numbers are:2,3,5,7,11
add any 2 and see if it is a composite number
if it is a composite number,count 1
That's it.Good luck.

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