Question

What number is composite 2,11,9,5

Answer 1

A composite number is one where it has factors other than 1 and itself.

Since 9 = 3*3, this means 3 is a factor of 9 and 9 is composite. The other values are prime numbers because the only factors of something like 11 is 1 and 11. Same for 2 and 5.

Answer: 9