Explanation:

Let’s break this down step by step:

- The given set is (90, 450, 810). If you look closer, each number after the first is a multiple of the previous one: 90 × 5 = 450, and 450 + 360 = 810—but more clearly, 90 × 9 = 810. But 810/450 = 1.8, which isn’t an integer. So maybe that’s not it, let’s take another approach.

- Check if there’s a common difference: 450 - 90 = 360, 810 - 450 = 360. So, second and third number both increase by 360 and 360—now there’s a pattern: Plus the same amount.

- So, the original set is in “add the same number” format, not multiply.

Now, look at each option:

Option 1: (5, 25, 45)

- 25 - 5 = 20, 45 - 25 = 20. Same difference each time. So, fits the pattern.

Option 2: (21, 105, 189)

- 105 - 21 = 84, 189 - 105 = 84. Same difference. Pattern again.

Option 3: (7, 35, 56)

- 35 - 7 = 28, 56 - 35 = 21. Different differences, not the same.

Option 4: (17, 85, 153)

- 85 - 17 = 68, 153 - 85 = 68. Consistent.

So, what this really means is that Option 3—(7, 35, 56)—is the odd one out because it doesn’t have the same difference between each number. All the other sets do.

 Option 3 is the correct answer.