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I am using Stack Exchange and its sites through my basic mobile Nokia C1 using Opera Mini 4.5.

I was prompted frequently to prove that I am a Human and not a Robot before providing an answer for a question which was not answered very quickly. It even happens for a question which was asked 1 hour ago.

The problem is, there is no Captcha shown to prove, only a hyperlink for a Captcha which link to Wiki and a Text box to type that Captcha.

Now, how can I prove I am Human without knowing the Captcha?

But I am able to answer after refreshing that page more than 2, 3 times. Is that any bug or anything else?

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