99,88,198,197,?,296,396

To find the missing number in the sequence 99, 88, 198, 197, ?, 296, 396, we need to identify the pattern or rule that is being followed. Let's see if we can figure it out step by step.

First, let's look at the difference between the first two numbers: 99 - 88 = 11.
Next, let's subtract 11 from the second number to get the third number: 88 - 11 = 77.
Now, let's add 110 to the third number to get the fourth number: 77 + 110 = 187.
Then, let's subtract 1 from the fourth number to get the fifth number: 187 - 1 = 186.
Finally, let's add 110 to the fifth number to find the missing number: 186 + 110 = 296.

Therefore, the missing number in the sequence is 296.