Respuesta :

gmany

Answer:

43

Step-by-step explanation:

Two other way.

1.

9, 16, 25 - are the perfect squares, 43 is not.

9 = 3²

16 = 4²

25 = 5²

2.

43 - it's a prime number, 9, 16, 25 are composite numbers
43 hope this helps you