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?

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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?
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?

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.

2,3,4,5 is distinct number, however 2,2 ,3 ,4, 5 is not distinct number. Distinct number means different number .
2,3,5,7,11 is the first 5, add 2 you got 4,5,7,9,13 . you got 4 is a composite number so your answer is 1