Find the odd one out in the given options: (1) 145 (2) 197 (3) 325 (4) 399

Recognize the number pattern.

Answer: The odd one out is 399.

Let's rewrite the numbers in each option and try to look for a pattern.

Explanation:

(1)145 = 144 + 1 = (12)² + 1

(2)197 = 196 + 1 = (14)² + 1

(3)325= 324 + 1 = (18)² + 1

(4)399 = 400-1 = (20)² - 1

In options 1, 2 and 3 the pattern is: Square of a number + 1

But in option 4 the pattern is: Square of a number - 1

Therefore, option (4) 399 is the odd one out.