To find the sum of the sequence $3 + 2 + 4 + 6 + 8 + \dots + 198$, let us carefully determine its structure:

Step 1: Identify the sequence

The sequence starts at 3, but after that, alternates between an increment of 2 and 0. This means the sequence behaves as: [ 3, (3+2), (3+2+2), (3+2+2+2) ]

Thus mathematic .