12 and 16 = 28
3*4 = 12
4*4 = 16
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12 & 16
12 and 16
the answer of the first 4 composite numbers is 27
The three composite numbers are 28, 30 and 32. Their sum is 90.
The sum of any two prime numbers is not always a composite number. The sum of 2 and 11 is 13, and 13 is a prime number, not a composite number.