Which of the following gives an example of a set that is closed under addition?
(Points : 3)
The sum of an odd number and an odd number
The sum of a multiple of 3 and a multiple of 3
The sum of a prime number and a prime number
None of these are an example of the closure property

Question

Which of the following gives an example of a set that is closed under addition?
(Points : 3)
       The sum of an odd number and an odd number
       The sum of a multiple of 3 and a multiple of 3
       The sum of a prime number and a prime number
       None of these are an example of the closure property

skullpatrol · Answer

Any ideas?

anonymous · Answer

b. i think

skullpatrol · Answer

Do you know what the closure property of addition is?

anonymous · Answer

like if you multiply 2 real numbers, you will get a real number??

skullpatrol · Answer

Yes, but this question asks for the closure property of addition.

anonymous · Answer

the sum of a prime number and a prime number!

skullpatrol · Answer

No, you were right the first time.