Explanation:

Here’s the thing—let’s look at the series step by step:

100800, 14400, 2400, 480, 240, 40

- 100800 ÷ 7 = 14400

- 14400 ÷ 6 = 2400

- 2400 ÷ 5 = 480

- 480 ÷ 4 = 120 (but the sequence gives us 240, which breaks the pattern)

- 240 ÷ 3 = 80, but the next number is 40

So, the correct pattern is dividing by 7, 6, 5, 4, 3, etc. The hiccup happens at 240—it should be 120.

Let’s check the options:

- 40: No, this isn’t where the break happens.

- 240: This is the odd one out.

- 14400, 480, 2400: All fit the pattern.

So, the odd number is 240.

Option 2 - 240 is the wrong number.