Question

Which of the following numbers is composite?
4, 5, 9, 15

Answer 1

4,9,15

Answer 2

thanks

Answer 3

A composite number has factors other that 1 and itself.
From the above numbers, there is only one which is NOT composite.
For example, factors of 4 are 1,2,5, so it is composite.

Answer 4

soo "mathmate" what is the answer then?

Answer 5

4,9,15 as Mertsj had it.
The question is probably incorrectly worded saying:
"Which of the following numbers IS composite" when there are three composites.

Answer 6

thanks