Prove that you are a human being

In continuing with my observations made here, I wonder if the following way of preventing someone from spamming a commenting system really helps:

____________ Spam protection: Sum of II plus III plus IV ?

If I really want to spam this site, I can write a simple routine to scrape the string matching 'Sum of ___ ?' and then feed that into Google like this:

Google search: II plus III plus IV

And there you go! You are spammed!

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