Explanation:

Let’s break down the sequence:

25, 26, 18, 45, ?, 106

- First, look at the pattern between numbers:

- 25 ? 26 (+1)

- 26 ? 18 (-8)

- 18 ? 45 (+27)

- Looks like alternate addition and subtraction, and the numbers changing (1, 8, 27…).

- 1 = 1³

- 8 = 2³

- 27 = 3³

- So next should be -4³ = -64.

- So, 45 - 64 = -19

- Check the last step to be sure:

- -19 to 106: 106 - (-19) = 125, which is 5³.

- That matches the cube pattern.

Now, about the options:

- Option 1: -16 – doesn’t fit

- Option 2: -18 – doesn’t fit

- Option 3: -19 – this is exactly what fits

- Option 4: -21 – nope

- Option 5: 14 – way off

Option 3: -19 is correct.