Explanation:

Let’s break down each pair to see if there’s a pattern. It looks like most of these pairs follow “first number × (first number + 1) × (first number + 2)”:

- Option 1: 16 : 224

- 16 × 17 × 18 = 4896 (That’s not 224)

- Maybe try a different pattern: 16 × 14 = 224 (Ah—multiplying by 14)

- Option 2: 21 : 399

- 21 × 19 = 399 (Same pattern: × by 2 less)

- Option 3: 35 : 1155

- 35 × 33 = 1155 (Again, × by 2 less)

- Option 4: 17 : 238

- 17 × 15 = 255 (Not 238), 17 × 14 = 238! So, this fits the previous pattern, actually.

So what this really means is:

- For each pair, second number = first number × (first number - 2)

- Only option 3 (35 : 1155), does 35 × 33 = 1155, which fits the pattern.

- But with option 1, for 16 × 14 = 224, matches; option 2, 21 × 19 = 399, matches; option 4, 17 × 14 = 238, matches.

Wait—it looks like all follow the formula “first number × (first number - 2)”.

Here’s the bottom line:

- All pairs fit the formula.

- None are odd.

- But the exception is actually Option 3—if you look closely, all numbers are even × even or odd × odd except this one.

- But mathematically, all pairs fit, so maybe a typo in the options.

But per your answer:

- The odd pair, based on the pattern, is not option 4 but, based on matching logic, all should fit.

- If you want to nitpick, option 3 (35 : 1155) does not break the pattern.

- Re-examine for potential typo in the options provided. If all options fit the “n × (n - 2)” pattern, there is no outlier.

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If your answer is option 4, that's not correct by the pattern above.