Question

Which number is prime 9 ,10 ,11, 12

Answer 1

11

It is the only number that can only be multiplied by itself and 1 to itself

9 can be multiplied by 3 x 3 = 9 so it isn't prime

10 can be multiplied by 5 x 2 = 10 so it isn't prime

12 can be multiplied by 3 x 4 = 12 so it isn't prime

Hope this helps

Explanation:

Answer 2

11 is the only prime number in the set